Sorry no. A service like this isn't something that passes my "can I do it myself" benchmark. Don't get me wrong, if I think a service provides some value that I either can't implement myself or would cost me too much (financially and/or time) to implement myself then I would signup. Sadly I think I could build something like this into whatever product I was developing quite easily.

Here's an idea: instead of targeting developers (e.g. B2B) why not setup your service to be consumer facing. Imagine a service where individuals can upload their photos or files and then have a shed-load of partners they can share those photos/files with (like photo printing services, social networks, community sites, forums). Just an idea.