Very interesting idea! This is really smart and handy for small business or blogs. I wonder what Dropbox thinks of this idea.. maybe they should incorporate it into their own service?

Hi, I'm one of Site44's founders. Dropbox has been quite supportive in helping us to use their API. If you're curious how we interact with Dropbox, read our guest post on their developer blog: https://www.dropbox.com/developers/blog/23.