Turn any doc into a signable online form

Here's an interesting tool: Chalk. It allows users to upload any document and turn it into an online form to be signed or filled out. Chalk allows the owner of the document to set the rules for how the forms are completed, tracks when a form is viewed or completed, sends reminders to people you've sent the form to, and allows users to download and print the completed forms from any computer. Here's a complete review from Educational Technology and Mobile Learning.