Favorite art/sketching apps?

[Gooster]

I was just wondering if anyone here had a favorite sketching (or general art studio) apps they could recommend, even paid ones. I use SketchBook Express at the moment and I do like, but I'm just curious. Thanks!

 

[Rocktapus]

i've been using Sketchbook Pro...i'm sure the others are good...but i've been using Sketchbook Mobile[which i LOVE] since it first came out on the first ipod touch...so it was a natural transition for me. with sketchbook, i have no immediate need for another sketching app.