I hear every so often that "There are no SMS forums or newgroups anymore." Well this is not the case. The SMS newsgroups are alive and still kicking.
If you go here http://technet.microsoft.com/en-us/sms/bb839598.aspx
and click on any of the SMS newsgroups links you are passed to a page that says "Welcome to Microsoft Discussion Groups " but no data is listed. This is partly due to a bad link which hopefully will be corrected soon. In the mean time here is a corrected link to get you o the Admin newsgroup, from there you can move to any of the other newsgroups.
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.sms.admin