Main release:Download the full versionDownload the patch from version 3.0.3 (144 kb)
Download the patch from version 2.3 (21.0 mb)
Download the mission pack (905 kb)
If you haven't used the Port before, you may want to download other files from the Port
website.
I figured I'd post this as a stopgap solution until 3.1 comes out, since so many people were having issues with the ship class names. This should fix that bug, as well as two other minor problems that I thought should be fixed. For those of you who don't like FilePlanet, Wing Commander Saga has mirrored the downloads in one of the posts below.
Also, don't forget we now have a subforum for Silent Threat: Reborn.

Here's the latest version of the readme:
===< FREESPACE PORT TO FREESPACE 2 >===
Version 3.0.4 12/22/2006
http://fsport.hard-light.net/
=======================================
This is a brand spanking new version of the FreeSpace Port that has been rebuilt from the ground up to provide you with the best possible FreeSpace 1 experience.
We've abandoned the attempt to keep the Port compatible with the main FreeSpace 2 campaign (considering the now-common use of the -mod feature and the fact that several ship stats changed between FS1 and FS2) and turned it into its own separate mod. We've re-imported the original tables and missions from FS1 with the absolute minimum changes necessary to get them working in FS2. It's just about as close as you can get to playing FS1 without actually playing FS1. 
As with recent versions of the Port, this file contains only the core files needed to play, so you'll have to download the mission pack separately. This was done to facilitate updates, since missions are changed far more often than core files. You'll also have to download (or patch) sparky_hi_fs1 if you want to play in 1024x768 resolution or higher.
This version of the Port was specifically designed to play simultaneously on FS2 Retail and FS2 Open while at the same time taking advantage of the additional features in FSO whenever possible. One of the benefits from this is the new way the music is handled. Music.tbl will no longer cause crashes with retail, and switching to the FS1 music is as simple as adding the required music files... no table-swapping or mission editing required!
=< MEDIA ENHANCEMENTS >=
If you own FreeSpace and/or Silent Threat, you're in for a treat! You can extract all the necessary files from the previous games and play the Port with full voice acting, command briefing animations, and music. If you prefer, you can download them prepackaged from the FreeSpace Port website.
Copy these files:
FreeSpace\data\cbanim.vp to FreeSpace2\data\
*.mve (on the FS1 CDs) to FreeSpace2\
Extract these files, using Descent Manager's VPVIEW32:
*.wav from data\voice\command_briefings in FreeSpace.vp to FreeSpace2\data\voice\command_briefings
*.wav from data\voice\special in FreeSpace.vp to FreeSpace2\data\voice\special
*.wav from data\voice\briefings in voc.vp to FreeSpace2\data\voice\briefing
*.wav from data\voice\debriefings in voc.vp to FreeSpace2\data\voice\debriefing
NOTE that data\voice\[de]briefings was changed to data\voice\[de]briefing (without the S) in FS2.
=< CONVERTING FSMs >=
If you've FREDded or downloaded any missions for FreeSpace 1, it's quite simple to convert them to run on FreeSpace 2 using the Port. Follow these steps.
1) Download and run a recent version of FRED2 Open. Any version including and after 3.6.9 should work.
2) Select File->Import->FS1 Misson. Select the mission or missions you want to import and the folder where you want to save them. The conversion will take a short time (usually only a few seconds, but longer if you're doing several missions at once) so if you get a "This program is not responding" message, ignore it.
That's usually it! If you get any "ship class not found" messages, you may have converted a mission in which the class names are slightly different in the Port. For example, missions which used the "big blast" Faustus now use a regular Faustus with a special explosion. The easiest way to fix this is to replace the ship class name in the original mission and reconvert using the steps above.
=< KNOWN ISSUES >=
Q: The ship listing in the Tech Room displays the wrong ships.
A: The best solution is to create a new pilot from the Pilot Select screen when you first start FreeSpace 2 (cloning your current pilot won't work). This will reset the tech room so that the proper ships appear.
Q: Whenever I click on the weapons database, the game crashes.
A: This is a bug in retail FS2. You can either use FS2 Open or visit the Port website for data on all the new weapons.
=< VERSION HISTORY >=
Updates in 3.0.4:
--Updated the music table to work with the improved FS1 music code (SCP).
--Tweaked several ship class names to properly use the "ship copy" pattern.
--Removed stars.tbl so that Lightspeed's backgrounds will be used if present (SCP).
Updates in 3.0.3:
--Fixed the crash caused by incorrect filenames for some interface art.
--Added the Terran Command traitor debriefing (for sm2-06a).
Updates in 3.0.2:
--Fixed the crash caused by the main hall referencing an invalid sound index.
Updates in 3.0.1:
--Fixed the crash caused by certain Orion nameplates exceeding the texture filename limit.
Updates in 3.0:
--Overhauled the Port to use the FS1 tables, including ships, weapons, sounds, and main halls.
--Added the revised and enhanced FS1 music table (SCP).
--Added the FS1 personas.
--Added the FS1 ranks (SCP) and medals.
--Reconverted the FS1 missions using the import feature in FRED2 Open.
--Restored the FS1 shockwave behavior (SCP).
--Added the following ships:
----GTF Angel (Venom/Woomeister)
----GTT Hunter (Zarathud)
----GTI Polaris Extension (Dark)
----GTI Polaris Pylon (Dark)
----GTSC Faustus (medical) (Dark)
----GTFr Chronos (medical) (Dark)
----TAC 1 (medical) (Dark)
----GTT Elysium (medical) (Dark)
----PVF Ulysses
----PVB Sekhmet
----PVSC Imhotep (Ryx)
----PVI Shah Extension (Dark)
----PVI Shah Pylon (Dark)
----SF Gorgon (Dark)
----SB Nahema
----Vasudan NavBuoy (Dark)
----Terran Probe (Dark)
----Vasudan Probe
----Terran Asteroid Base
----Vasudan Asteroid Base (Dark)
Updates in 2.3:
--Fixed a few more crash bugs.
--Fixed a bunch of mission bugs in both the FS1 and FS2 campaigns.
--Some more small fixes that I forget.
Updates in 2.2c:
--Fixed the out-of-bounds game sound indexes that were causing crashes.
--Rebalanced and fixed bugs in some missions.
--Fixed the conflicts between Cyclops and Cyclops#short.
Updates in 2.2b:
--Port reorganized by splitting into three VP files: the essential files, the hi-res interface art, and the hi-res texture maps. These can all be downloaded from the FSPort downloads page.
Updates in 2.2:
--A cleaner, ultra-efficient ships.tbl now accepts all tech room descriptions.
--New animated FS2-style ship selection interface art! Wow!
--Selected engine sound effects from FS1 integrated.
--A remodeled PVI Karnak with better LODs and cleaner geometry.
--The ever-present bug fixes and enhancements to the original campaign.
Updates in 2.1:
--Fixed a bunch of table errors.
--Added a new splash screen.
--Fixed glowmaps for the Athena and Fenris.
--Enhanced multiplayer support with Towani's dogfight weapons.
--The Amun, Anubis and Athena models are now more stable.
--Dozens of new briefing icons by Black Wolf! Please note the following:
----The Large Ship icon is now the Faustus science cruiser
----The Shivan Support Ship icon is now the Demon
--A much nicer version of the pilot select screen.
--Slight changes to the FS2 missions Into the Lion's Den, Slaying Ravana, and Clash of the Titans II.
--Lots of mission fixes in the original ported campaign.
--FS1 subspace POFs included. Subspace looks much nicer now; no more 'rings.'
--Ancients cutscenes now included in the ported campaign file.
--All instances of the Vasudan Light Laser have been renamed to the VLL-9 Laser, so it doesn't spill over the HUD.
--Tweaked the Huge laser turrets, the Megafunk turret, the VLL, the Havoc, the Unknown Bomb, and the Unknown Megabomb.
--Faustus model modified so that anything towing it goes forwards.
--GTC Leviathan skin hue slightly modified, to differentiate it from the Fenris.
--New Ancients cbanim, borrowed from one of Setekh's renders. I'm sure he won't mind.
--Interface art for the SF Dragon (Terrans) is now complete, thanks to Sesquipedalian.
--Fused Karnak is now included.
--Squad logo added for the Vasudan Imperium.
--Asteroid-field-debris has been reskinned.
--Pilot images from FS1 now included.
Updates in 2.0:
--Hi-res FS1 maps included - not all of them, just the ones at a higher res than the FS2 versions.
--All Terran and Vasudan fighters and bombers now have squadron insignias.
--Brand spanking new weapon interface art in the FS2 style.
--FS1 weapons now use the FS1 sound effects.
--Tables stabilized by squeezing under the 130 ship limit.
--Changed the Hades to have five engines instead of one.
--Subspace palette fix.
--New pilot selection screen.
--Fixed Clash of the Titans II bug caused by renaming the Bastion's table entry.
--Still more bug fixes in the original campaign.
--Shielded Lucifer (by DTP) and corresponding HUD icon (by Sesquipedalian) added.
--Silent Threat converted (badly) to FS2.
Updates in 1.5:
--Fixed hitpoint values for most of the imported ships, including nearly doubling the Athena's shields and armor.
--Karnak now has dock points, fighterbays, and turret paths, thanks to DTP.
--Weapon animations added for those who don't have FreeSpace. Only one weapon table is needed now.
--Fixed the turrets on the Amun.
--Added credits to Act III, mission 10.
--Fixed a few small bugs in some of the missions.
--Added transcripts of the Ancients cutscenes to the campaign.
--Added an icon for the Karnak installation, and edited the icons table to accommodate it.
Original release 1.0:
--All FreeSpace ships and weapons added to the FS2 tables. FS1 to FS2 model conversions provided by Dark.
--Main FreeSpace campaign converted to FS2.
--PVI Karnak, Railgun, Fang, Barracuda and Havoc added for use in future campaigns.
--Earth background added for use in the final mission.
=< LEGAL MUMBO-JUMBO >=
All material included herein is copyright 1998-1999 Volition, Inc., Interplay, and THQ. Ported with permission to FreeSpace 2 by Peter Oliver (Galemp) and Ian Warfield (Goober5000). You may use these files for your own missions, campaigns, and mods on a no-cost non-commercial basis. Hosting provided by Hard Light Productions (http://www.hard-light.net/) No Vasudans were harmed in the making of this Port.
S I L E N T T H R E A T : R E B O R N
coming soon
(honest!)