Admittedly, I am on a SEO kick, because of a project that I am working on. As such, here is another resource that will help your SEO efforts.
Optimize PDFs for search engines
Before this week, I assumed that PDFs weren’t very good at communicating with search engines because of the format and how it functions similar to an image.
The person that posts a PDF can stack the deck to allow search engines to perform better in terms of searchability.
Here is a great resource produced by Search Engine Land that outlines how to do this.