Games that consumed my life:
EVE-Online: Took two years of my life, and even after a year of abstinence I want to go back.
Rome: Total War: When I wasn't playing EVE I was play this.
GTA: San Andreas: Booked an astounding 60 hours into just the storyline itself, + countless hours for everything else.
Audiosurf
Golden Sun TLA: Spent 3 weeks trying to beat it.
Fire Emblems 6,7,8,9,10: Too much fun...
Tales of Symphonia: 130 hours and three playthroughs, and the game's still as good as when I got it.