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WOW, I was playing it for 9 years.

WoW would have been a close second on my list. I could probably go back in and see how many hours I had logged, but I haven't played it in forever. I left my list as a reply on another comment. Lot's of great memories of hiking up and down STV before I had my 60% mount at level 40...

That would be Football Manager closely followed by Comand & Conquer - Red Alert

C&C for the win! Red Alert was awesome, but I really like Red Alert 2. I remember the first time I saw the original I was blow away by the mechanics. I had never seen Warcraft or Starcraft before, so it was all so new to me. My games would probably be the original Final Fantasty for NES, Diablo 3, and Might and Magic 6,7,8.