"The Microsoft adCenter AnalyticsBeta team announced today the end of the adCenter Analytics beta program.
The beta has been closed, but the program will remain available to current users through December 31, 2009."
More information is in the blog post here:
http://www.adcentercommunity.com/blogs/analytics/archive/2009/03/12/adcenter-analytics-beta-to-close.aspx
Chris Norred, online community program manager for Microsoft adCenter, API and publisher programs.