http://www.google.com/support/forum/p/AdSense?utm_source=aso&utm_campaign=en-asblog_2008-10-30&utm_medium=et

Google launched today an AdSense Support Forum. It is very similar to the forum for Google talk published some weeks ago.

http://adsense.blogspot.com/2008/10/youre-invited-to-new-adsense-help-forum.html

There's also one for Android Market:
http://www.google.com/support/forum/p/Android+Market

From Google's mail announcenemt, an indicator as to the reasons behind the change of location:

<<The new platform offers the following features:

* Question & answer format to help you find answers quickly
* Improved search functionality and integration with the AdSense Help Center
* Better spam detection and prevention
* Public recognition of Top Contributors and frequent posters
* Ability to subscribe to ask questions and receive answers via email>>