Searching the World Wide Web
Advanced Google Searches:
The Search Engine List - comprehensive list of major and minor search engines with links and abstracts describing each of the search engines.
Meta Search Engines (search engines that compile information from several search engines)
Search "The Invisible Web" aka "The Deep Web"
The invisible web is information on the web tha cannot be found with general search engines like Google or Yahoo.
Some Invisible Web Search Engines