Yourselves
PC & accessories if you can
HDDs for sweeping
Headset/headphones
Power extension strips
Pillow & Sleeping bag
Shower & wash kit (you smelly bastards)
Boozes
Monies for food & pubs
Special Lan Hats
Beards
Titan Quest, Titan Quest: Immortal throne, Dungeon Siege II
RTS
Dawn of War, Battle of Middle Earth II, Starcraft, Starcraft: Brood War, C&C: 3, C&C: Red Alert 3, C&C Generals, Rise of nations, Rise of nations: Thrones and patriots, Atrox, Submarine Titans, Universe at war
FPS
Left 4 Dead, Painkiller, CoD4, Quake 4, Quake 3 BF2, CSS, DOD Sauce, Killing Floor, HL2 DM, The Ship, UT3
Other
Worms Armageddon, Audiosurf, DEFCON, Trackmania United Forever