Frothsof has already started this to some extent, but I think that developing his site a bit more to include a communal aspect might be worthwhile.
Maybe Frothsof is the one, I dunno. I usually get a log in to these sites, but I have to say most of them look dead after 2-3 months.
I definitely appreciate that yall have maybe checked out my blog, but I really dont have a desire to try and make a forum out of it. I will eventually be soliciting 4e fans for homebrew material for my free fanzine, but other than that, I have no real plans to do anything "communal" with it. In my opinion, Wizards' site is still the best forum bet as far as just 4e discussion is concerned. It just has a built-in crowd. There are a couple of other forums out there that are ok for specific things, like the off-line tools and online gaming, and I certainly wouldnt want to discourage anyone from trying something, but I am really just interested in keeping a blog and putting out some free 4e stuff as a hobby.