well, you've probably already tried it but a game i end up resorting to when i'm bored is ******************. There is a free version of the game plus a pay to play if you ever decide but the free version has hundreds of hours of gameplay. It's a fantasy mmorpg but the community is pretty immature. If you ever want to put a couple dollars into a game there is guild wars. Unlimited online play and you can get the first copy of the game for about $15 at gamestop these days.
I like Missy's suggestion of addictinggames there is crazymonkeygames too it's pretty similar
Edit: Looks like my first suggestion is frowned upon haha and i can understand why. just forget i mentioned it