I saw this application aired a couple of months ago that allowed for 3 dimensional sketching or drawing. I think the app was developed by some guys in Toronto and it was/is truly amazing. I saw, I wanted it and I thought of what I could do... When they previewed the app it is represented very rationally, meaning the creations they developed were very architectural, very clean, and mostly quite boring... sorry guys, but with a tool like that you got to let rip. At last some one has. I know it should have been me, but I havent got the money or the contacts... YET.