Best Publishers Ads Network

[arthur]

the two yahoo, and Google are the best, they will cost you accordingly to your keyword, and it placing position per click,, the rest of three i don't know much about the,, but hopefully the same criteria they may have..

[arthur]

it depend on you ad keyword and its placing positoing... but every search engines do have its own criteria,, depends,,

[leahmarie]

For me, still Google adsense, because of it's reliability and knowing it's a product of google, it's gives out it's authority presence amongst the ads.