Thanks, William, for including myITforum.com in the your list!
Read it…
http://www.clientarchitect.com/blog1.php/2008/06/22/best-forums-to-get-answers-for-sccm
BTW: myITforum.com promotes the same level of support for all of the System Center products. myITforum.com provides several email lists and also a huge number of active web-based forums.