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[edited by: soapystar at 5:26 pm (utc) on April 3, 2004]
My suspicion, after various test searches, is that Yahoo is blocking sites that run Google Adsense advertisements.
For example, we tried a search for "Fayette Art Museum."
In the top 10 results, Google returned 7 sites that do not run Google ads and 3 sites (including ours) that do. Yahoo returned 9 sites that do not run Google ads and one site that does (although it appears that this may be an old page on a site that no longer runs Google ads).
I suspect that the key for the Yahoo search is whether a site references Google ads in its robots.txt file. None of the sites returned by Yahoo in this sample search do so. Our experience, as noted by other forum posters, has been that the Yahoo Slurp hits our robots.txt file several times a day, but goes no further.
I have no idea if this constitutes restraint of trade in the freewheeling world of the web, but it is certainly a dramatic skewing of results. Yahoo should own up to it, if this is the new policy.
Our site is extremely rich in content and doesn't engage in link swapping, spamming or multiple domain names running the same content.
I have watched Google to see if they promote sites running AdSense, and our experience has been that we haven't fared better or worse. We actually joined the program fairly late in the game and enjoyed high rankings long before we began running ads. Yahoo, on the other hand, appeared to drop us overnight, for reasons unknown (and, unlike Google, has failed to answer emails).
[edited by: upstater at 6:04 pm (utc) on April 3, 2004]