Only one of the best space flight sims from the late 90's has been reborn. When the company that wrote it shut down they released the source code to the world. Now you can play it in all its glory with updated graphics and over a decade's worth of mod support.
http://scp.indiegames.us/You can now play Freespace 1, the FS1 expansion Silent Threat, FS2, Blue Planet and many more campaigns all run on the FS2 engine. I downloaded the updates last night and gave it a run. *insert drooly emoticon here*
There are several stand alone mods based on the FS2 engine as well. Battle Star Galactica, Wing Commander, and Babylon 5 just to name a few.
If you were unfortunate to have lost your copy of FS2 you can pick one up for a whopping $6 at gog.com and then download the updated content for free from the link at the top. (Yes, I have been revisiting my old games again for sheer fun factor).
Now if they would only do something like this for the X-Wing Vs. Tie Fighter series I think I could die happy.
MechWarriors = MWLL - Check
Tribes 2 - Check (see the Tribes 2 post)
FreeSpace 2 - Check
Unreal Tournament (GOTY) - Check (native still runs great even in W7....instagib BABY!)
X-Wing vs Tie Fighter - Fail (Greedy Lucus bastage)
4 out of 5 ain't bad.

Oooooohhhhh...and look what I just found for XvsT!
http://davidcmoisan.wordpress.com/2010/02/17/the-force-is-with-me-tie-fighter-95-on-windows-7-x64/