Yahoo made updates to its search index this week that are supposed to improve the quality of the search results, but many people are unhappy, probably the ones that lost search rankings. CNET has an article:
The search engine updates are aimed specifically at growing the list of relevant Web sites in Yahoo’s search index, said Tim Mayer, director of product management for Yahoo Search. The company is also in the midst of tweaking its search algorithm, which determines the ranking of search results, he said.
The update, which began Wednesday, is a work in progress that won’t be complete for another week or two, Mayer said. He urged Webmasters to be patient until the process is complete.
"We need to ensure quality results for our users," Mayer said. "If we feel that this is a much better experience for our users, we feel it’s the right thing to do."