I've already bookmarked Xavier's thread as a favourite
*needs more screenshots*
Halo is already the best game ever in my opinion, and it looks like the only game that will snatch it's best game title will be Halo 2 of course
But I will imagine that it'll be a close run in thing with Fable, as that looks simply amazing - will at least be the best RPG ever. And then there is SPlinter Cell of course. GameSpy says it's the best game on XBox and I've got the playable demo and it never gets boring.
But nothing can replace my Halo. Especially Multiplayer-wise