It talks about different types of search engines, how they work, and other related topics. Plus it is up to date. I recommend it to anyone who is not already an expert, and is interested in learning how to find things on there own.
http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/FindInfo.html (http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/FindInfo.html)
Edit: Fixed URL