List of major world wide pay per click search engines. Pay Per Click
I recommend starting out using the pay per click search engines with the greatest distribution first as they have faster feedback loops, higher traffic quality, and greater distribution.
Google AdWords (1) - powers Google, Ask Jeeves, AOL, IWON, Earthlink and many other sites
Overture (2) appears on Yahoo, MSN InfoSpace, AltaVista, AllTheWeb, and many other sites. Owned by Yahoo.
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Pay per click search engines usually drive most of their traffic based on their partner network. Pay per click ads are mixed in with meta search engines and usually exist at the top of search results on major search engines. (personal rankings)
Enhance Interactive (6)
Espotting (European) powers many European portals which are not powered by Overture or AdWords
Findology - smaller PPC which allows you to select which partners your ads will appear on and lets you target your ads geographically. Primarily focused on lead generation, retail, and adult traffic markets. (8)
FindWhat (3)
Google AdWords (1) - powers Google, Ask Jeeves, AOL, IWON, Earthlink and many other sites
Kanoodle (5) - Kanoodle has some really cool features and a good contextual advertising program (especially for financial type websites).
LookSmart - while actually being a directory, LookSmart has a decent sized distribution network. I have been told many complaints about their poor customer service though and when I tried their engine their traffic quality was crap. Recommend avoiding (4)
Overture (2) appears on Yahoo, MSN InfoSpace, AltaVista, AllTheWeb, and many other sites. Owned by Yahoo.
Search123 (7)