I’ve quickly become a big fan of Paper, an app for iPad that does a fantastic job of letting you easily draw, sketch, and write things on your iPad. I should also add paint, as it does a beautiful job of replicating water colors on the screen, not just the intensity, but the mixing of colors as well. I’m already having fun sketching things on it, and I now want to get a stylus for it to try and take notes (which is still a bit awkward to do with your finger).