Promethean Planet

This is a super organized website that has already accumulated a list of resources for our smart boards
The Math Open Reference site has many java based applets to help bring geometry to life. By using the "Full Screen" links, you can fill the entire whiteboard space.
NCTM Illuminations Page has links to numerous math activities that lend themselves to the interactive whiteboard. Grade bands and topics can be selected.
The MathTools site is run by The Math Forum at Drexel. This site serves as an index to many other sites that are categorized by grade level, topic, etc.
Directions and a navigation aid are here: They even offer online orientation sessions! It is a fantastic repository of information.