Here is a good link from where u can freely download most of the Computer science and IT related eBooks.

http://www.flazx.com

search book

Search some book, say “Professional AJAX  ” and click on it, it’ll redirect you to the following page

search book 3

Click on Direct Download

search book 4

Select any of the servers

download

Click on Download ebook, Save ebook and Enjoy reading… 🙂