Just thought I'd mention that there don't seem to be any obvious links to the GM or SC game creation tools on the GMG site in places where newcomers would easily see them...
One possibility you might consider would be to reorganize the navbar on the side, maybe adding a "Game Creation Programs" page at the top of the Developers category, and list GameMaker, SilverCreator, and perhaps a few others on the page it links to.
You might also consider adding a more visible link to the GMG Manual under the Forums section, and renaming Forums to something more general, such as Communication or something. The current link to the GMG Manual is buried somewhere that isn't very easy to find, and the GMG manual hasn't had many edits lately (other than by me and a lot of spammers).