Here are some great Web 2.0 based ideas for brightening up teaching and learning:
Tarsia creator – to create all sorts of puzzles based on mathematical shapes etc
http://www.vuvox.com – create linear presentations and collages of pics.
http://www.imagechef.com – customise pictures and avatars
http://www.jigsawplanet.com – make your own jigsaws out of pics or text
www.classtool.net – all sorts of things to make