How can I get online engineering & technology ebooks,newsletters & other tools for free?

Question

free ebooks,articles on various aspects of engineering & technology,which will help me for my further career,as I am student(undergraduate) of engineering

Answer 1

http://www.engineeringtalk.com/
http://www.eng.auburn.edu/admin/marketing/engineering.html
http://www.mcquay.com/McQuay/DesignSolutions/NewsLetters