Hello,
Here are the most viewed adCenter API topics on MSDN for September 2009.
Microsoft adCenter API Version 6 Microsoft adCenter API Release Notes Microsoft adCenter API Programming Reference Microsoft adCenter Campaign Management API Reference Campaign Management Service Operations AdGroup Data Object Campaign Management Data Objects What's New in the SDK for the Microsoft adCenter API WSDL Overview Developing with the Microsoft adCenter API
Also, remember that adCenter API Version 5.1 sunsets on October 31. Ensure that you migrate to adCenter API V6 by October 31 if you haven't already done so.
Thank you.
Walter Poupore Developer Content Manager Microsoft