Meta Search: Searches across multiple search engines at once.
http://clusty.com/
http://www.copernic.com/index.html
http://dogpile.com/
http://www.hotbot.com/
Crawlers or Spiders: Search engine sends “spiders” out into the web to collect information.
http://www.google.com/
http://www.yahoo.com/
http://www.ask.com/
Directories: People compile and organize websites based on the site’s content.
http://directory.google.com/
http://dmoz.org/
http://lii.org/ LIBRARIANS’ INTERNET INDEX
**If you are interested in learning more about search engines, check out Search Engine Watch**
