This is a short list of some sites I find useful.

These two sites provide great general help in addition to search engines’ help pages: 

• Finding Information on the Internet: A Tutorial by the Teaching Library at the University of California at Berkeley
• Google Guide

Some extra sites with more info:

• google.public.support.general FAQ
• The Search Engine List  
• Business Intelligence Resources
• Internet Tutorials

 Specialized search sites:

• Implu is a free online tool for prospecting, networking and market research. They have contact info for thousands of executives.
• Pipl is a people search engine. Free but will have links leading to paid sites.
• Big5Hire is a free custom search engine that searches the web for resumes and social networks for profiles.
• CVFox is a free resume search engine; I haven’t used it much but it looks interesting.
• SearchHacker is a set of fun custom search engines

 Selected Metasearch engines:

• IXQuick
• SurfWax
• Zuula

Info about websites: WhoIs