One of the exiting opportunities of the iPad is its potential as a digital sketch pad - something I've been eagerly awaiting. So I downloaded SketchBookPro (see a quick demo below) and I ordered a pogo sketch stylus pen because you have to use your finger to draw otherwise, and that can be problematic.
Although I do wish the touch sensitivity of the pogo was even more sensitive, even more attuned to thins and thicks, and worked with a higher ppi than 72, I have to admit this is a GREAT evolution towards a true digital sketch book. I am able to do a rough and email it to myself to then work on it more on the 'big' computer. And although I'm also not very good at drawing on my iPad yet, I imagine a comfort level will easily develop.
So, overall, this is a great first step and I expect to have the digital sketch book of my dreams a reality within a few years.