Addictinggames.com for a good time waster.
Facebook has some cool applications.
y8.com has a variety of games.
Dressupgames.com if you want to dress up things.
Cartoonnetwork.com, Disney.com, and Nick.com has games from its shows.
Teennick.com has games for teens.
And, finally, Yahoo! Games of course!
that site is hilarious lol