This is a great collection of interactive games, videos and resources for K-7 teachers.
http://www.kindersite.org/ - Again most of this can be used with a Wacom tablet/slate or your eBeam.
The resources are all sorted into learning areas so finding something for your class should be fairly easy. I do like the story section.
These are all links to other sites and then you can go on from there exploring for more interactive resources at each site.
For those of you who have an interest in computer history / code breaking the Bletchley Park site has a virtual enigma machine running in JAVA - link here.
lets make some code.