I have to admit that I don't always understand the appeal of SMARTBoards (or any other interactive whiteboard). That is probably because I often see them being used as nothing more than expensive LCD projectors. Then sometimes I see IWBs being used in a manner that makes me stop and say, "hmmm, now that is neat." If your thoughts about interactive whiteboards are like mine, you might benefit from reading Why Teachers Love SMARTBoards. The document was created by James Hollis who runs Teachers Love SMARTBoards a blog and training service.
Another good blog about resources for interactive whiteboards is Danny Nicholson's The Whiteboard Blog. I've mentioned Danny's blog before because I often find good IWB-specific resources in his blog posts.