Had a short play with an E-beam interactive whiteboard today.
Blimey! It's fab!
Teeny tiny sensor and touch sensitive pen mean incredible portability - it uses any surface at all for projecting onto - whiteboard, wall, anything firm really.
And it seems just as usable as both Smart and Promethian boards I've used in the past.
The hardware is similar in many ways to Mimio boards, but the software seems much richer in features, though it might not have the depth of content that comes with SmartBoard Galleries, for example.
Saying all that, I only used it for about 5 minutes, and I'm going to have a proper go tomorrow, including trying it with some pupils.
Oh, and the price? Not including projector - about £350 - an absolute steal.