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I think that there are two things at play here:
1 - Yahoo is favoring sites that were already in it's existing listings, and seems to give a little boost in ranking to sites with a listing in their directory
2 - The results seem to be "human eye clean", rather than just the usual google clusterfuck of spam and junk. I have a feeling this may be done by tracking what actually has been clicked in the past, using that data to extract better sites to put near the top.
I could be wrong, and I probably am, but there ya go.
Alex
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