Does Dropbox have an API that gives read/write access? Being able to drop photos into my dropbox and having them resized and uploaded automatically would be killer. Also much more user friendly than AWS for non geeks.
Dropping photos into a directory and having those resized and uploaded is just a script that looks for photos in a given directory and posts them to any of the photo sharing sites with an API, no? But then you don't really own the storage of your photos (or at least aren't billed for it - which implies some level of ownership).