Here's the latest build with TrackIR support. You TrackIR users can now rejoice and bask in your situational awareness. Freespace now supports 5 degrees of freedom (Pitch, Yaw, X, Y, Z). Though, the X, Y, Z TrackIR axes aren't very noticeable unless you have cockpits enabled.
Non-TrackIR users should also be interested in this build. I implemented neat little features that'll make looking around a lot easier. The orthogonal padlock hat views don't instantly switch, but they smoothly slew. Even more notable is the target padlock view feature which allows you to fix your viewpoint on any targeted ship or subsystem. Very useful for neutering starships and dogfighting.
EDIT: I forgot to mention that free looking slewing commands have been removed in this build because of the pilot file corruption issues. I doubt anybody will critically miss it but FYI.
Note to TrackIR users: included in this package is a DLL file. This must be in your directory where the executable resides or else TrackIR support won't be enabled.
I hope I don't kill my webspace bandwidth at my university's CS Department :\
http://wwwcsif.cs.ucdavis.edu/~chos/fs2_open_trackir.zip