Looks really nice, but as helpful as the four-paned image is, I think it would be really useful if you had a link somewhere to a (semi-)technical overview of what's actually going on.

Like a page of screenshots of the actual service UI and some details as to how everything is set up (for example, I initially thought that the uploader would also need a dropbox acount. After looking again, I'm pretty sure that's not the case).

It just seems rather jarring that the only thing you can do from the home page is give airdropper access to your dropbox.

That said, it looks like an awesome service; I'm sure I'll be using it.