Well:
Halo 3, ODST, Mass Effect 2, Oblivion, Gears of War, Assassin's Creed 2, Sonic the Hedgehog 2006 (I was young and foolish), Left 4 Dead 2, Modern Warfare 2. And that's just for the XBox 360.
And also for the 360, Lost Planet 2. I wish, however, I had rented that before I bought it. Really don't like it. But, I did get 3 free t-shirts in GameStop from it (was only meant to get one. Dude was really sound), so I can pretend I spent ?30 on t-shirts and a fiver on the game, which makes me feel better.