Summary
Google recently announced it was granted patent 7,668,832 for "Determining and/or using location information in an ad system".  This patent contains eight (8) claims, including two (2) independent claims.
This report provides a patent analysis including a detailed assessment of the two independent claims.  This report also evaluates the patents applicability and impact on Google competitors as well as the location infrastructure companies and the wireless carriers.

Table of Contents
Executive Summary
Google Patent
Claims Analysis
Impact on Competitors
Yahoo
Microsoft
Location Infrastructure Companies
Wireless Carriers
Summary and Recommendations