Sources.net
The most pratcical and effective tools for marketing your website, such as search engines, webtools, keywordproviders, web advertising companies and some practical guidelines for web marketing.
International Keyword Advertising
Tacoda
Revenue science
http://www.revenuescience.com/
Adbrite
Quigo
Industry brains
Google Adwords
Overture
Kanoodle
eSpotting
Business.com
FindWhat
E pilot
Search123
Enhance
Exactseek
Anoox