Preorder and get
4 new Ghost Recon Island Thunder maps
Demos of Rainbow Six 3, Ghost Recon, Ghost Recon Island Thunder, and Splinter Cell
and 3 new Splinter Cell missions:
Kola Cell (already on Live)
This is good even if you have Live because now there's a hard copy of the mission on disc.
By the way don't forget to preorder Rogue Squadron III for the GC. You get the 1982 Star Wars Arcade Game as a second disc.
PS2 will have Ghost Recon Jungle Storm (Nov) which is Island Thunder and
8 more single player missions
3 new multiplayer modes
online co-op for 2 to 8 players