Free games to play from work/school

Hey all,
Lately i found myself bored a lot at work with tons of spare time to kill.
Instead of staring at my screen, i figured it would be more productive to play some online games instead
I got some recommendations about a few games, but I didnt like most of them, except these:
https://www.casino-online.com/flash-games/

I like casino style games but from work i can only play the free flash games, so any other recommendations would be appreciated.
thanks!

nonoba.com has a bunch of free games, some casino style ones also i think. if you have facebook/bebo/tagged or myspace theres a game called texas holdem poker you can play for free