Time in parenthesis, games sorted by platform.
PS3: Rock Band 3 (unknown), Final Fantasy XIII (80 or so), Final fantasy XIII-2 (64, still working on Platinum, will be 70ish when I'm done).
SNES: Breath of Fire 2, Donkey Kong
PS1: Final Fantasy IX (unknown, but I've played the game through to full, completed every side quest at least 10 times now)
PC: Dragon Age Origins (200+, still not tired of it), Mass Effect (100+), Mass Effect 2 (100+), Red Alert (unknown), Red Alert 2 (unknown), Tiberian Sun (unknown), Settlers II (unknown, campaign completed many times, countless skirmishes), Starcraft II (unknown, but shitloads in multiplayer), Counter Strike (1.1 -> 1.6, Condition Zero, Source, Global Offensive - unknown. Shitloads), Far Cry (unknown, played through it at least 4 times), World of Warcraft (raided for 4 years, played for 6. When I quit last summer I had 6x85s, 4x80s and 20 or so other characters under 70), Rift (currently got 41ish days /played on my main rogue who's just gotten 60, got a 50 warrior and 49 mage - played since last summer), Civilization V (steam says 131 hours), Endless Space (83 hours)
Gameboy: Pokemon Red/Yellow/Sapphire/Emerald/Diamond/Platinum/Soul Silver/Black/Black 2 (unknown, but probably as much, if not more, than the other games combined. Been playing for 10+ years after all)
...I think that's all :p