Adobe:
Photoshop Touch app lets you quickly combine images, apply professional effects, share the results with friends and family through social networking sites like Facebook, and more — all from the convenience of your tablet.
A first review is available at MacStories.
Why so many buttons on screen?
Do they disappear?
I understand the size limit, but it’d be nice if it had a proxy mode for working with larger images. It could work on a low-res version and apply the changes with the desktop version.