Jason Nazar from Docstoc has created a site where any type of document can be uploaded or downloaded for free. You've probably seen the docstoc viewer on techcrunch. It sounds kind of uninteresting until you realise that the documents get a lot of search traffic (eg people looking for mortgage forms, legal forms, etc) and that they become a perfect tool for lead generation. If you're interested in working with Jason as a lead provider, drop me a line and I'll put you in touch.