Nielsen Online yesterday released its rankings of U.S. search share for September. Overall search increased 9.4 percent year over year to 8.1 billion searches. Google had year over year growth of 20.8 percent and received 59.7 percent of searches. Yahoo! had a year over year increase of 1.5 percent and received 18.1 percent of searches. Microsoft had a year over year increase of 7.1 percent and received 11.8 percent of searches.