You can play Halo multiplayer, system link, and over the Gamespy network thingie, Angrist.
Most wanted games:
Project Ego (Xbox Live maybe)
Star Wars: Knights of the Old Republic
Panzer Dragoon Orta
BC
Brute Force
Blinx
Morrowind
Halo Online (Xbox Live)
Splinter Cell (Xbox Live)
Star Wars Galaxies
Shenmue II
Crazy Taxi 3: High Roller
Unreal Champion ship (Xbox Live)
Ninja Gaiden
Deus Ex 2
Too many more to list...
