I started http://boxysign.com 2 months ago. It is a way to share and sign documents with just a link! It's been profitable from the start - ableit still on a very small scale.
btw, I think I broke your site when trying to upload two test PDFs. The first worked correctly, but second never finished processing and now every page says "Application Error". The Done button on BoxySign's Account Settings dialog does not seem to work (but the X button does).
Also, the sharable URLs seemed disconcertingly short for documents that may contain private information.
Yes, that is a bug I need to fix. Thanks for catching it.
Indeed, and that is by design right now. I chose to focus on the clearest solution to the end user to start, but do have plans for longer/harder-to-guess urls. I'm considering moving that list further up my todos though. (working on .doc support right now)