January 15th, Ben reported that Yahoo Search Replacing Site Titles in Search Results Listings, and then on January 17th, I dug into it more with Danny to come up that we believe the titles were from anchor text, specifically internal anchor text. In any event, Tim Mayer of Yahoo! has commented at our site saying it will be fixed tomorrow (i.e. today).
We launched a fix to the issue with lower case titles coming from anchor text. You should notice some changes tomorrow. Tim
After a quick check of one of the results that had this issue, i.e. a search on searchbliss, the number one result no longer is pulled from anchor text.
Before:

After:

Thanks Yahoo! for fixing that! What exactly was happening? We have not received official confirmation on our theory.
Forum discussion continued at WebmasterWorld.
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rustybrick in Yahoo! Search Optimization at January 24, 2007 7:08 AM
Comments (6)

Comments
It was because of this comment last week by... Guess Who!
http://www.ysearchblog.com/archives/000397.html#comments
Posted by SearcH EngineS WeB at January 24, 2007 07:47