Haha thank you! Yes it works fine on an iPad - in fact better than an laptop because using a finger to draw is so much more fluid and intuitive than a mouse or touchpad. Here's a video of me using WhiteboardFox.com to draw with my iPad: http://youtu.be/MDEHFHG1l3Y?t=1m10s

And yes I had the same thoughts last year when I was looking to work with a remote programmer: "Surely, surely someone has a half-decent solution?!". At the time, no. Now, yes :)