As you would expect from Adobe, the iPad photo editing application, Photoshop express is is a polished well thought out app that works well. You have some fine control over the enhancement controls such as exposure, saturation, contrast and tint. The effects and borders are good to use in that they are not silly, in order to take away from the photo.
It is easy to straighten a photograph, or even just to rotate it through 90°. You can even share your photos through the photo express thing with Adobe or through Facebook. It is a shame that Twitter is not on that list. I am quite happy to recommend his application to iPad photographers all photographers that use iPads.
You get access to one of the photographs you have synchronised from iPhoto to your photo roll on the iPad and the application is a fun iPad photo editing application to use.