UPDATE: Now published in HD on YouTube. Here is the link to my YouTube channel. The videos below are in the correct aspect ratio but are lower quality.
Wow. I had no idea this would be so popular with everyone. My server has been slammed. To make the videos more easily available to everyone around the world, I've uploaded them to YouTube.
I've received numerous awesome ideas (from people all around the world) that address some of the limitations and make using the iPad as an IWB even better. I hope to get at least one more quickcast up this weekend to share those ideas. And finally, I'll republish the YouTube videos in HD this weekend as well.
Thanks for all of your feedback. I hope this is a practical and affordable solution for educators everywhere!