If you play in education or the corporate meeting room sector do get along to see eBeam  on booth N518. We had one of our more pleasant booth tours (a young lady who “didn’t know us from Adam” but who treated us attentively) and explained in much detail what they had to offer.
The eBeam products are well thought out and engineered and seemingly make ‘interactivity’ quite simple. The eBeam Edge enables any whiteboard or projection screen to write, annotate, and capture to an application as the user is writing with an electronic stylus. These guys have some bright ideas and have even brought some of their not-yet-released products along to the show to share with attendees.
We like a lot.