MechWarrior 4: Mercenaries
This has the best overall feel of the MechWarrior series even The pacing is much quicker, battles are intense, fast, furious and start immediately. No upgrade to the graphics or overall game-play.

Neverwinter Nights
Neverwinter Nights is the closest anyone has come to bringing the RPG Dungeons and Dragons to the computer. Limitless game play capability.

James Bond 007 Nightfire
If you're looking for a good single player first person shooter, with some James Bond stealth and class, then you'll find that in James Bond 007 Nightfire.

Medal Of Honor: Spearhead
For those who finished MOHAA a long time ago, this should satisfy your appetite for the short term until the next title is release.

America's Army: Operations
The US Army wants to give you a peak into what goes on in their operations, for free. This is a great first person shooter that's well worth the time/space it takes to download.