Timewasterz is a great repository of free online games. Don’t visit here unless you have some time to kill. Timewasterz is one of those cool sites that uses the Z at the end of a word instead of the standard S. (*grin*)
Timewasterz has a gigantic selection of online games. Find some casual gaming favorites like Bookworm. There are plenty of choices of games to play. Games are categorized right on the main page, so there is no having to click around to actually find the games.

Plenty of games and nice layout. Remember to have some free time on your hands before you surf over there.