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If you are an advertiser, and are looking to advertise specifically on sites that have google adsense, then the best thing is doing a search (on the 3 main search engines) and trying to find relevant sites with all your keywords.
It possibly would be a good idea for google to actually have a google adsense publisher search facility
* Big suggestion to Google * :P
Make a google adsense publisher search for your adwords customers and help them find current active sites that are relevant to their industry... (might I suggest the name for it be GAPS (Google Adsense Publisher Search :O)
It could be a feature which could return the google adsense publisher number with a link to the homepage of the site and it would be worked from meta data - keywords... the adwords person would be able to select as many or as little publishers to run Exclusive ad campaigns on.
It will enable Adwords advertisers to plug the GAPS in their marketing campaign and produce a better ROI (in theory)
find a list of sites in industry X
Is there not an international trade directory for your industry listing relevant trade portals?
One of my core sites is such a directory and I list all I can find. Interestingly they've all adopted AdSense after I started using it:-)
can I find a list of sites who have adsense on them
My initial response is that I have absolutely no idea.
Would this be a good thing for Google to reveal or not, I'm not sure?
I can't see the harm yet, then again, I suppose if one were chasing after high paying keywords then it would be possible to examine the top sites' optimisation ploys and techniques.
I can see where it would help advertisers target their ads to relevent sites, but I would fear the possibility of it being abused by the shadier sort that does exist out there. Until G comes up with some way of just withholding revenue from questionable clicks, I would not be in favor of such a risk generating feature.
e.g. you type in: web hosting ads by gooooogle
Since the AdSense code is an iframe searching for "ads by goooooogle" with a keyword won't produce the results you're looking for.
However, Google does provide a way to find AdWords advertisers by keywords. Not sure if this will help you though.
Adwords allows you to target specific sites that run Adsense
Gee...if I had half a brain cell I would be dangerous!