PatrickDeese - 4:07 pm on Apr 8, 2005 (gmt 0)

> No, AdSense has no clue where your visitors came from...

I am with incredbill on this one - I think they very much are aware, and in fact I have pretty credible evidence that suggests that the ads change according to the referral string, so if you start getting a lot of traffic for a lesser value term - you might find that your overall EPC drops - no matter which search engine sends you traffic.