comScore just released some new, more in depth local search data.

Via SEW,
"According to the study, 63 percent of U.S. Internet users (or approximately 109 million people) performed a local search online in July, a 43-percent increase versus July of 2005. Google Sites (30 percent) and Yahoo! Sites (29 percent) garnered the largest share of local searches in July. Microsoft Sites captured 12 percent of local searches, followed by the Time Warner Network with 7 percent."