Um, see the subject of this post.
All except the following forums now require registration to post (all can still be viewed without registering):Find Old Games
Get Games to Work
Game Help, Hints and Tips
Essentially this has been done to try to cut down on the all-smiley posts and other useless posts that often crop up in places like Game Creation.
To read a recent discussion on this issue, please see this thread:
http://www.dosgames.com/forum/about5150.html