I haven't been to a tech conference lately, but a colleague went to MACUL recently and purchased an ONfinity C2. It's kind of like a SMART board in reverse. You use what looks something like an old fashioned "pointer" to touch any flat surface onto which your image is being projected. It's very portable and easy to get up and running.
Go to their website for more info, pictures and video: http://www.onfinity.com/