I just wanted to let everyone know about this great sketching app that Ray Frenden introduced me to, it's called Procreate and it's become my favorite sketching app for the iPad. Unlike other drawing apps Procreate has a lively and organic looking line that is highly customizable, and you can draw in what feels like a much more natural way than other apps that offer a more uniform line. It's a really fun drawing tool. Because the line is more organic you can work out ideas quickly and intuitively. Other drawing apps have a very flat line which can slow you down, I find. The one drawback to Procreate is the inability to save files right to your photos on your iPad, however that's not a huge issue as its so easy to do a screen capture. Right now the app is on sale for .99 cents but I think it's usually about 5 dollars.