Like Andy_MC, I played WoW until I was 70, and then stopped playing. Its a great game but doesn't really allow for casual playing and I need to concentrate on writing my own game. I had withdrall symptoms for a while but feel better for giving it up.
I recently found Runescape though, the free browser based MMO and play that for 30min at lunchtimes.
I recently found Runescape though, the free browser based MMO and play that for 30min at lunchtimes.