I am going to take a wild guess and say that yahoo is not indexing new sites at this moment. Or it might be the case that it takes a couple of weeks until yahoo adds new sites to it's index. Currently I have a site that is about month old and ranks well in both MSN and Google (page 1 on a few search terms), but it is not indexed in Yahoo. My site does have google adsense, but I doubt that Yahoo would sink that low to attack a competitor. Just my two cents...
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