Beginner's Guide to Searching the Net
Includes not only links to major search engines, but also advice on search technique, evaluation of sources, comparisons of search engines.
Advanced Searching: Tricks of the Trade
An excellent guide to using search engines, comparing them in terms of how they search, what they search, what boolean strategies they allow, etc., and offering sample searches across a variety of engines.
Award-winning advice on when and how to use search engines.
Finding Information on the Net
A tutorial -- a really well done presentation on how to analyze your information needs, phrase your search, select the search engine that will do what you need to do.
