I'll only do the ones I currently own, otherwise it will get too long.
Wii:
Currently playing occasionally:
Donkey Kong Country Returns
Mario Kart Wii
PS3:
Currently playing occasionally:
Assassins Creed 2
Call of Duty: Black Ops (Already beat, but I still intend on doing harder difficulty and getting trophies, etc.)
Still to play (and/or stopped playing and want to start again)
Modern Warfare 2 (I still want to beat all the spec ops on 3 stars, plus get the intels)
God of War 1 (Still want to do the challenge game thingy)
God of War 2
Dragon Age Plus Expansion
Infamous
Borderlands
Final Fantasy IX (PSN Classic)
PC:
Portal (Haven't quite beat it)
Age of Empires 3 Plus 2 Expansions
I think that's it...I want to start getting more done on that list, but have been playing a bunch of Starcraft 2 and League of Legends lately...I'm thinking this Summer will present a LOT of free time for me, plus next year I'll be living in a dorm, where I should have loads of time ...then I can finally get to the MASSIVE backlog of games I have that I haven't yet purchased, lol.