Send a file to your Dropbox from its URL.
web2db.ssl.dotcloud.com
web2db.ssl.dotcloud.com
Oh and they let you use their SSL certificate for free, which is pretty nice. The only downside is that the certificate isn't recognized by some versions of the Android browser, but I'm sure that will be fixed soon enough as their support guy is incredibly quick to respond to issues.
Future features would be being able to let users specify which folder they want the file to go to and be able to change the file name. Also, just FYI the example link is broken for me. But I'm more interested in the use case, since this seems cool but I don't know when I'd find it helpful.