As an adwords advertiser do you get to know where your clicks are coming from? Are you able to see which adsense publishers are sending the traffic to your website?
OK, and if you notice many clicks coming from one particular website and these clicks don't convert do you report this to Google?
For anyone who doesn't have access to logs, and can't get into google analytics yet, there are also sites out there that offer free stats tracking. Basically, you register, stick a chunk of code on each of your pages, and it will tell you where your traffic came from, and you can follow anyone's 'path' through your site. Ritecounter (http://www.ritecounter.com) is one I used to use, since they're one of the few that don't force any sort of ad, although for a while they were going down once a week, and of course then it looked like my page wasn't ever finished loading. Anyway, there are many tracking sites out there, and one of them might be an option for some.
I've given statcounter a try and found the way they display my stats is very easy to read and follow. I was also amazed to see that their Google PR is 10/10. I guess I'm not the only one who has come to like them!
I suggest you analyse and analyse. Its not just where the clicks come from. Its where the sales or conversions come from that counts. Work backwards from the sale.