What do you think about scribd.com ? Have you using it? I see, it's a large base of preprints and books.
I've uploaded more than 300 pdfs for 1 particular niche. Some have heavy views, which has brought in visitors to my site, so I recommend it -- I just think having quantity (and quality) is the key.
Scribd is good. I used it recently for the first time, and my article for a non- competetive term is at #11 on Google without any links at all.
Hi folks, Scribd is the most popular document sharing site available, with over 50,000 uploads each day. Scribd has established its authority and web presence. Document sharing is a great way to promote brand awareness. Most businesses have flyers, brochures, and other marketing content around their offices and other places offline. It is extremely important to make all of your marketing materials available on the web. Scribd makes uploading all of your documents a simple task. Important factors about Scribd: It’s free Gain exposure to search engines Track reads and downloads Unlimited uploads of most file types Social networking with Twitter opportunity Keep branding in mind when creating documents to get uploaded on Scribd. And Docstoc is also another great alternative of Scribd.