As seen on Mediapost:

WEB USERS CONDUCTED MORE THAN 5.1 billion search queries in October--marking a 15 percent increase from June, according to a Nielsen//NetRatings report released Tuesday. Google maintained its leadership position, garnering 2.4 billion search requests, or almost half--48 percent--of all searches. Yahoo! accounted for 21.8 percent of all searches, followed by Microsoft's MSN, which was responsible for 11.3 percent of search activity.