Books are becoming technologically updated. Have you seen the advertisement of Kindle? Or downloaded an audiobook in your Ipod? Type mobile ebook reader on any search engine and the results are numerous.

I am amazed at the number of information available on pdf. More information you can find than blogs, news websites or podcasts. But they are not as search friendly as direct crawl from a regular site.

I did a search pdf, and used a search engine specifically made for pdfs and got good results. Which both useful and pleasurable to search.

Example, I typed in the word writing on this search engine and got useful results readily available in pdf. The good thing about pdf,  it is easily printable.