That app looks nice. Just one question: how does it handle RAW images? Like Aperture or like iPhoto? With this I mean, if it creates a JPEG version of the photo and that is what it edits, or does it has non-destructive editing of the RAW file.
A MBA 11" would make a much better job than the iPad for photography, but I don't want to loose the benefits of the iPad (easier to carry around, use it in bed, moving it around the house, etc.). And I really don't need much editing of my photos while traveling, I'll just wait to return to my desktop at home.
But backup in travels has always been a hassle for me. I hate taking a laptop just for backup, and the iPad seems like an ideal device for it. In the other hand, uploading photos to Dropbox in hotel connections wouldn't be very nice, me thinks.