Search Engines

AllTheWeb (Y)
http://www.alltheweb.com

AltaVista (Y)
http://www.altavista.com

Ask.com
http://ask.com/

Ask Jeeves
http://www.ask.com/index.asp

Google
http://www.google.com

HotBot (Y)
http://www.hotbot.com/default.asp

Bing
http://www.bing.com/

Teoma
http://www.teoma.com

Directories

About
http://www.about.com

Go Guides.org
http://www.goguides.org

Gimpsy
http://www.gimpsy.org

Joeant.com
http://www.joeant.com/

Open Directory Project
http://www.dmoz.org

Scrub The Web
http://www.scrubtheweb.com/

Yahoo!
http://www.yahoo.com/

Directories of Search Engines

Beaucoup 2,000+ Search Engines, Indices and Directories
http://www.beaucoup.com/

Search Engine Guide - Search thousands of specialty search engines.
http://www.searchengineguide.com/searchengines.html

Pay-Per-Click Search Engines

Google Adwords
http://www.google.com/adwords

YAHOO Search
https://signup12.marketingsolutions.yahoo.com/signupui/signup/loadSignup.do?l=en_US&m=o&promoCode=US2310

Bing Microsoft Adcenter
http://advertising.microsoft.com/search-advertising?s_cid=21

FindWhat
http://www.findwhat.com/

Sprinks
http://www.sprinks.com/

7Search
7search.com

XUPPA (Formerly Bay9)
http://www.xuppa.com/

Kanoodle
http://kanoodle.com/

Ah-Ha
http://ah-ha.com/

Looksmart
http://www.looksmart.com/