Are there any programs that allow you to draw on your itouch and see it on your computer?

Logitech's "Touch Mouse" is a free application in the App Store which allows you to use your iPod Touch as a touch-pad. I've used it myself and it is very easy to set up and works well. It requires a simple piece of software installed onto your computer and a quick setup and you're ready to go. This application works over wi-fi, so you will require a wireless router in order for this application to work.

I have added the iTunes Store link in the related links at the bottom of this post.