Adobe has been pumping out the touch-enbled apps at a pretty rapid rate over the last couple of years. Their free form drawing app, Ideas, has been given a refresh up to version 2.7.
Adobe Ideas is a fee app. The latest update delivers support for the Pogo Connect pressure sensitive stylus and the ability to share your work to other applications such as Photoshop Touch. The application supports all iOS devices. Drawings can be opened and edited using Illustrator, making it a useful tool in the field.
Adobe Ideas [App Store]