A useful element of Dropbox is the shared folder stuff, as a way of passing files which are too big to email to someone else, without having to deal with web ho

A useful element of Dropbox is the shared folder stuff, as a way of passing files which are too big to email to someone else, without having to deal with web hosting. If you tell someone "go spend $X to sign up so I can send you a file", it pretty much kills that feature. Admittedly, I'm not certain that this is actually essential as a core element of Dropbox.