Does anyone know where I can find the demographics on each search engine and/or directories: Altavista Msn Lycos Yahoo_eng Google Ask Alltheweb Global Directories Yahoo Open Directory Pay Per Bid Engines Overture I have only found outdated articles on the issue: content.websitegear.com/article/ppc_demographic_targeting.htm Reason I'm asking is because I want to be able to rotate certain targetted affiliate ads based on the type of user most likely to come to my website based on which search engine he/she is coming from. Thx