Alfred beat me to posting my own content  :)

We recently asked a number of students to use Popfly and submit a Popfly creation (a mash-up or a game).  10 of the games that were created were picked by the Popfly Team in the Games We Love entry in the Popfly wiki.

I've embedded a couple games so you can try them out.  The other links are at the bottom … beware … these games are fun!