I have to agree with some other PP's about it more a visibilaty issue... there is no clear linking back to the main site which is about the magazine.. I stumbled upon it the one day... not sure how... but originally I found the forums through a google search that took me directly to a thread in the Blended Family forum.
I suggest an integrated web system that ties the boards and main site together... there are several open source type programs on the web available... the trick however is to find someone savvy enough in php and what not to integrate it all, because it will need tweaking.
One site that is very large (a Wheel of Time book club) that has integrated both their main site and forums with some web coding is tarvalon.net... if you go to their forums pages (tarvalonforums.net) there are links down the left hand side that direct you back to parts of their main site.
The biggest down fall to this sort of suggestion is it would be like a clean slate, because you would likely need to upgrade or change the message board system you currently use... but with the advancement in technology and wanting to expand, it can't hurt to review it. There are a few different portal messageboards systems that offer the main site incorporation into the forums... I am particuarly fond of phpBB3, which I know does have a portal system now too.
((Note: You could always add an archive forum that links back to this board... with phpBB3 particularly you can have a forum that is just a link... comes in handy))
If you'd like some more examples of this, I'd be happy to help.

I haven't built any phpBB3 portal sites myself, but have built 2 phpBB3 message board communities and am familiar with many of the functions of that system.
I honestly wouldn't change the name, coming from a marketing background, and web background... you have been around for several years... it would cause too much confusion and you have too large a base that knows the community as MDC, motheringdotcommune... From a standpoint of marketing and web design, I strongly recomend looking into a more integrated/upgraded portal system to house/showcase both the forums and magazine site.
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