Lone Mavs Fan Homepage http://web2.airmail.net/jdport/ Just scroll down, and go to the forums. There's always a ton of knowledgable Mavs fans there.
The Rockets are actually my 2nd favorite team after the Mavs. I'm more of a Texas Sports fan (all Dallas teams are first in my book though).
in the www.bleachermob.com there are links to the forums of every NBA team in the Forum madness part.