Depends on what you like but one that I found that passed the time and was interesting....Diner Dash.
I got hooked on that for a little while....of course for even smaller games to just pass some time you can go to:
www.popcap.com They have a bunch of mini games. Also Yahoo has some good ones. Not sure how small of a game or what you are into, but I thought that I would share!
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