It's great to see that some of the big names of webmaster forums already signed up for NB! So there is no need to go to other forums, just do your business on NB will be more than enough IMO.
GoScript.Net signed up here (the person with most iTraders on DP.
And a lot other people signed up already Not that they're amazingly active, but that doesn't matter. As long as they do post some informative stuff it's awesome already!