The latest Search Share Rankings have been reported and summarized on Search Engine Watch.
Microsoft and Yahoo took a tumble in their year-over-year search share in October 2008, according to Nielsen Online. Yahoo was down 12% and Microsoft was down 19%. Ask.com took a hit as well with a decrease of 22.9%. Google continues to dominate the search engine industry at a 61.2% market share.

See the full article and the complete chart of search engine rankings