Other updates to the API include;
+ Local time zone support
+ Enhanced access to more data for reporting
+ Added fields for traffic estimator by replacing avgPosition with lowerAvgPosition & upperAvgPosition, replacing ClicksPerDay with lowerClicksPerDay & upperClicksPerDay and replacing cpc with lowerCpc & upperCpc
+ Zero Impression Reporting
+ Unique Request ID to track API requests
+ Geo Codes Standardization
You must update the API to version four by July 12, 2006.