Since SMART and Promethean boards gained in popularity a few years back, every Joe Schmo computer company has come up with some kind of whiteboard or interactive projector or special funky pen. At the time, I looked into both SMART and Promethean products. SMART won hands down.
You see, it's not really about what the board itself can do; they pretty all much work the same. It's about what the software will do. SMART software allows the teacher to create something that is truly interactive. You can set up sorting activities, quizzes, and animations. You can embed YouTube videos and attach other files. And the best part? There is this whole community of teachers out there making and sharing their SMART resources on the SMART Exchange. While I've been a member of the Exchange forever, I just recently submitted my first file. After all, that's what collaboration is all about. Don't just lurk and download - add to the knowledge bank!