This thing—erm—projects your phone. There's a little USB camera attached to a clamp and you just tap away like a madman, sending the video out to a laptop or overhead projector. I suppose this would be good for training on the handheld, etc. but it looks a wee bit kludgy. Luckily, it's designed to be portable so it won't fall apart like that Lego and rubber-band contraption you've been using thus far to project your—erm—phone. Available online for $199.
Product Page [Project-A-Phone]