AdCenterRep has also left the forums.... I guess. They now have heir own support forums, but they aren't very busy aswel.
You are eligible to join Microsoft Adcenter, as long as your site's content doesn't contain any of the following: http://advertising.microsoft.com/Home/Article.aspx?pageid=708&Adv_Articleid=3211
its a very good programme, but why does it available to few countries. ??? many good content sites wish to join but they are not belonging to listed countries.