My main box, in a boring steel case:
Celeron 800 (not overclocked, didn't bother) on an Abit BE6 (440BX chipset)
384 MB of PC100 SDRAM
6 gig WD something, I bought it from a guy whose case was getting too full
20 gig Seagate Medalist, UDMA/66
Philips 32x8x4 CDRW
Sony 4X CD-ROM
Geforce3 Ti 200, 64 MB of RAM
PC Concepts 104-key ergonomic keyboard
Cambridge PC Works
Logitech Mouseman wheel
CIC Handwriter 6x9 tablet
15" Princeton flat-panel
Saitek ST200 joystick, with one of the four buttons nonfunctional
and the kicker:
SoundBlaster 32 PnP ISA sound card with 2 MB in 30-pin SIMMS for MIDI samples.

And that's the fast system I use.
My daily workhorse:
HP Omnibook 800 CT subnotebook
Pentium/166MMX
80 MB RAM
2.1 GB HD
Neomagic MagicGraph 128ZV with 2 MB of VRAM
10.4" 800x600 display
Aand my digital photo frrame (it just sits on my desk running a slideshow:
IBM Thinkpad 701c (remember the butterfly keyboard?)
486 DX4/75
8 MB RAM
360 MB hard drive
10.4", 640x480, 256 color display
Yes, I like to run antiques.