Can be anything, PS3, PC, Wii, DS etc.

For me:

GBA:
Final Fantasy Tactics Advanced
Pokemon Red
Pirates of the Carribean
Virtua Tennis
LOTR:TT

PS3:
Uncharted 2
Assassin's Creed 2
Transformers: WFC
Resonance of Fate
Yakuza 3
FF XIII
Valkyria Chronicles
Tom Clancy's Rainbow Six
Star Ocean: The Last Hope
Fifa 10

I do a lot of trading in and saving (finish a game and sell it off)

PC:
Counter Strike Source
Half Life 2, Episode 1, 2
Portal
Team Fortress 2
Mass Effect 1+2
Dragon Age: Origins
Mount and Blade: Warband
Empire: Total War
Medieval II: Total War
The Movies
Heroes of Might and Magic 5
Brothers in Arms: RTH30
Brothers in Arms: EIB
LOTR: BFME
C&C: Generals+Zero Hour
Red Alert 1,2 + Yuri's revenge
Stronghold
Pharaoh+Cleopatra
AOE2+Conquerors
Call of Duty 1
Z
Warzone 2192 (Or something like that)
Hotel Giant
Sims 1+expansion packs
Sims 2 (Not mine, sisters)
Warcraft 1, 2 and 3+FT


Looking back, I really have a pretty decent collection. Share yours.