I played the volleyball one for 10 seconds before swearing at the blue guy. Fuck that cheating prick, why do I always lose the close to the next speed bounce contests between us. IT ALWAYS GOES BEHIND ME.
Bluesnews.com is a great place to find little flash games. It's a gaming/tech news site, but there's usually at least one game in the "Out of the Blue" section.
I almost forgot to mention my favorite game site Orisinal. Sadly it hasn't been updated in ages. Most of the games are more art than gameplay, but the art is amazing.
Some of my favorites, For gameplay: Floats, The Pond, Roperunner, Chicken Wings and Cranky Crabs. For artistic appeal: Cats (love the music), It Takes Two, Pocketful of Stars and Floats. There are many more that are good as well.