It would really be ultra+ super awesome if you would just integrate Dropbox into the file picker. Being able to load and save directly to and from Dropbox would let me do a lot of my work on the road quickly and easily.
THe DropboxSync.py script kinda works once you find it on GitHub, figure out a way to actually get it into Pythonista, make sure the prerequisites are OK, get an API key, set up a new application in Dropbox's developer site and verify that you have the right paths, but it's kludgy and awkward and totally not user friendly. Having Ddropbox integration right in the app would really be amaze balls cool.