It appears that all the major search engines have been reported to be updating their indexes in some way. Yahoo has been reported to have updated its algorithm or index, although there is no official word from Yahoo on this as of yet. And MSN Search has confirmed that an update has occurred to their index recently. While Google’s update may not be represented in the index, Yahoo and MSN’s updates have reports that the search results have indeed changed. For the better or worse – that is in the eyes of the beholder.
SOURCE: Search Engine Watch