A simple, high performance, offline whiteboard app

When I started looking for whiteboard apps for my new tablet pc, I was a little shocked that the main ones needed you to be online and they were pretty slow. Like, when you draw on the pen, you can see a noticeable lag between your pen tip and the pixels being drawn. So I made this little app primarily for me, but I thought others might find it useful as well. It's simple, fast, and offline. It's still early days, so please give it a try and let me know what you think.