The original Crimson Skies was an excellent PC game. Crimson Skies 2 (technically Crimson Skies: High Road to somewhere or the other) continued the adventures of Nathan Zachary and his crew. It wasn’t just a game in the same universe, but a sequel.
And just because it hasn’t been mentioned yet for some reason:
Halo. (Still fun to play, much better than Halo 2.)
Project Gotham Racing. (Again, better than PGR 2 in some ways, not as good in other ways).
MotoGP (The best iteration of the MotoGP series IMO. The sequels aren’t as good).
Voodoo Vince (platformer with a lot of personality)
Tork: Prehistoric Punk (same, the kids like it)
Blinx (same, BUT NOT Blinx 2)
JSRF (also a platformer with a lot of personality, don’t make the mistake of thinking it’s an extreme sports title)
Kung Fu Chaos (especially if you want to play w/ friends)
Amped 1 or 2 (fun once you get the rhythm, they’re different from the SSX games)
Super Monkey Ball Deluxe (maybe not technically exclusive, but the best last-gen version)
Crimson Skies was a pack-in with an XBL set, so they flooded the market. Don’t confuse its price with its quality.