Mapmakersheaven has been down for a while because the domain name expired, and we've had a hard time getting in thouch with the person who bought it for us back in the days. We are working on it - and MMH will be back with all the content. It's just a matter of time..
Meanwhile if you are a true df2/mmh junkie you can access the site and the forum at:
http://69.16.236.84/~varg/ allthough it might be a little buggy.
-varg