Aps for the iPad (Photo)

I am an avid photographer so photo aps are something I would be interested in.  So far I have used three.  Camera - which allows you to link your iPhone and iPad - using the iPhone as a camera.  It is a fun trick but not very useful (although well worth the price of 99¢).   PhotoPad - which has a series of editing tools for you photos (including cropping, brushes, rotating, scaling and a series of filters) - plus it has a way to communicate with the developers to request features.  This is well done and simple!   Filterstorm - Is also a first class editor which includes a demonstration video.  I might well use the iPad for a lot of my photo editing with these two aps.