I saw a link on Twitter to a post at Gizmodo about the application Brushes for the iPhone and iPod Touch. The images linked to via this article looked great. I checked the reviews in the app store to see what other people thought of the app, and decided to spend $2.99 (the price at the time) for Brushes. I had been looking for a good drawing app for the iPhone, and this app appears to fit the bill. The tools are simple and easy to use. Its a great way to entertain yourself when you have a few minutes. And you'll have it with you wherever you go. I highly recommend it.