Search Lectures Notes and Tutorials on websites of top universities.

This custom google search engine searches lectures notes, handouts, slides and other academic course related material on about 80 of top ranked universities. Check it out.

http://pitchforksearch.blogspot.com/

or http://www.pitchfork.tk
Add it to your firefox search engine list from Mozilla Developers Page. 
http://mycroft.mozdev.org/search-engines.html?author=Naglak

or add this to your google homepage from here
http://www.google.com/cse/home?cx=partner-pub-4203250063227859%3Axst9dy4kjyw&hl=en_US