Games:
Moto GP (I'm actually still playing this more frequently than the others)
Counter-Strike
Phantasy Star Online
NASCAR 2005
Mechassault
Burnout 3
Guilty Gear X2
Unreal Championship
Ghost Recon
Rainbow Six 3
Carve
NFL 2K3
strong in racing games, weak in fps and fighters...
I also have Steel Battalion, but have yet to get Line of Contact
live games
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NBA Live 2005
Rainbow Six Three: Black Arrow
Splinter Cell: Pandora Tomorrow
Return to Castle Wolfenstein
Crimson Skies
Outlaw Golf 2
Outrun 2 - live demo from Xbox magazine
Tetris Worlds/Star wars
Soon to add
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Halo 2
March Madness 2005
Ultra Bust A Move
NFSU 2
Madden 2005 (soon as it gets cheap i got the ps2 version)
Games I have and play on live
Counterstrike
Crimson Skies: High Road to Revenge
Dead or Alive: Ultimate *
Ghost Recon: Island Thunder
Guilty Gear X2 #Reload *
Halo 2 *
MechAssault
Midnight Club 2
NFL Fever 2004
Outlaw Volleyball
Rainbow Six 3
RallySport Challenge 2
Star Wars: The Clone Wars
Tetris Worlds Online Edition
Top Spin
Unreal Championship
Unreal 2
XIII
I play system link stuff on Xboxconnect as well, but am to lazy to list all those.
Games: Halo 2, DOA Ultimate, Outlaw Golf 2, ESPN NFL/NBA/NHL/MLB 2K5, Top Spin, NCAA football 2005, World Championship Poker, Ultra Bust a Move, Mechassault 2
Games - Halo 2, Crimson Skies, Unreal Championship, PGR2, Rallisport 2, Mechassault, Splinter Cell PT, SNK Vs. Capcom 2 (LOVE this one, but can almost never find a match. If you have it, look me up!), Topspin.