Sony - PlayStation 3, PSP, etc.
I traded in Red Dead, Uncharted 2, New Super Mario Bros Wii, and a shitload of other wii games, and ended up with about $88 in store credit, so I browsed around and picked up, Resident Evil 5 Gold edition, Ratchet & Clank a crack in time, ^ Motorstorm pacific rim. I still had about $20 left so I put that down for Black Ops....
I have played about an hour of each game, and I am pretty stoked as my early impressions of these games makes me believe that was one of my better video game purchasing decisions. I am enjoying all three so far, and all are so different from each other that I will easily be able to break up the monotony if I get tired of a certain style. Add in Madden '11 and MW2(which will soon be traded in for black ops) and I pretty much have a collection of games that are all pretty different.