It's a really cool idea. It's tough however. If your target audience is the main stream public, which it seems like it, then there will always be a mental barr

It's a really cool idea. It's tough however. If your target audience is the main stream public, which it seems like it, then there will always be a mental barrier of learning how to operate yet another machine. Most of this audience don't even know what a server is. Aside from that, you will be competing with every cloud-base service out there, even the ones that are not on the radar yet. You end up spreading your resource to develop interfaces for music, photo, documents, etc, while sites like flikr only need to worry about photo. Personally I'd pick an easier battle field, but then again, what's an entrepreneur but someone who innovates and fights hard battles.