Love it! A few suggestions...

Would like the ability to put sketches in folders (particularly your tutorial ones- theyre great as a reminder when I need them but I dont want to see them all the time) and it would be cool if I could rearrange the order. Also if there was a way to lock/unlock sketches... I was showing a friend how cool the app was and they proceeded to "undo" a few steps of one of my sketches! :) Its fabulous though!!!

annasense about Sketches