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Previous likes have been Gauntlet, Baldur's Gate (one and two), Timesplitters 2.
Not sure if you are after online titles or just multiplayer ones you can play with mates in your house.
If so I also suggest
Pro Evo 3 - Best fooy game out
Eye Toy Play - Always enjoyable
Tekken 4, Smackdown or knockout kings give a bit of multiplayer violence
Tiger woods 2004 - surprisingly enjoyable multiplayer
SOCOM (already out)
SOCOM II (already out, but only recommended if you're a team player)
Champions of Norrath (out on Friday, will be great, even greater if they iron out the bugs from the NTSC version)
This Is Football 2004 (again out on Friday, best online footie game by a longshot, makes FIFA 2004 look like a poor cousin).
Previous likes have been Gauntlet, Baldur's Gate (one and two), Timesplitters 2.