these should be in order of most played, pretty much anyway
1 - World of Warcraft, over a year /played on my main char, not played for a few years now
9000+ hours
2 - Legend of mir 2, my first mmo, played it for some years (most of you won't know it, it's originally from south korea and it's quite big there and in china or was anyways, i don't keep track)
4000+ hours
3 - Counterstrike, over the past 6-7 years i've played this a few months here and there
3000+ hours
4 - Tiberian Sun multi-player, imo still is the best RTS ever made, strategically it's much better than starcraft whereas starcraft is a bit more about zerg (handspeed), played it for a year about 10 years ago
750+ hours or so
5 - Lineage2, played that for a few months, before World of Warcraft
500+ hours
6 - Uncharted 2 multi-player, played this for a few months as well, it was (and still is) surprisingly good, especially when compared to mw2 and co
300+ hours
7 - other than that there's the single players... of which i've probably played final fantasy 7, 8, 9, 10, 12 the most, mainly because i've completed all of them at least twice, 7 probably like 5 times
700+ hours at the very least, most likely quite a bit more