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A number of changes are in the process of being rolled out to Yahoo's search engine. According to the company:
"We've rolled out some changes to our index with fresh web data and updates to our crawling, indexing and ranking algorithms over the last few days. We expect the update will be completed very soon. Throughout this process you may see some changes in ranking as well as some shuffling of the pages in the index."
The news follows Yahoo making moves last month that provided webmasters with guidelines for how they can tailor their sites such that the search engine can do a better job of indexing it. For end users, the update means you may start seeing sites moving around in the rankings on a given search term.