What are some affiliate programs that pay by search?

[affiliatemaker]

I know that Amazon and Google offer an affiliate system that involves a search engine.

What are some other affiliate programs that offers a commission path through a search engine on your site?

 

[dhscott]

Lycos pays £0.02 (GBP) per search via TradeDoubler. I'm not sure if the program is still running or not however

 

[khuram16]

I suggest using tradedoubler... good $$$ if your site gets hits.

 

[bojianh]

Can some one elaborate on 'affiliate system that involves a search engine'?

How does it work?