Google is pleased to announce that AdWords API v2009, which was released to a limited whitelist in June, is now available to all API users. Compared to previous versions of the AdWords API, v2009 offers new features and greater speed at a lower cost. Over the next couple of months, according to Google they will be releasing more functionality like asynchronous calls, partial failure acceptance, keyword optimization tools, and reporting.
http://adwordsapi.blogspot.com/2009/08/adwords-api-v2009-beta-now-available-to.html