Planet PDF: resource for everyone

I was about to buy a book in Amazon.com and came across the review. One review was saying that "this book is really great ... but the problem is that it is very expensive ... it is available free!"
The last word drew my attention.
Quickly I grabbed google search and found that to be true!

So, if you want to grab some free pdf, "planet pdf" is very nice place to be.
http://www.planetpdf.com/free_pdf_ebooks.asp?CurrentPage=1

http://www.planetpdf.com/about.asp