What's your goal when it comes to the main site? Is it a place you want people to spend most of their time?
If you wanted a trim main site, my suggestion would be to take a "quick look" approach to it, offering nothing but the most important information on new scripts, event systems, graphics, and news. Imagine a stripped down and condensed version of the "This Week on .org", with a daily format. The daily format would be a bit hard to do with the current staff, so perhaps select a team of seven "Today on .org" writers, and assign a day to them. They then write the article covering the previous day's happenings, in the vein of a newspaper. The rest of the space on the main site would be devoted to a logo and a simple top bar with a few essential links.
However, if you were considering a beefy main site, a smattering of all the information you'd ever want would suffice. Perhaps a "box format", as it were, would be in order. You'd have the biggest section devoted to news and the like. You could have a small box for videos, a sidebar for all of the latest files or forum topics, another box for a poll, etc. You could add another sidebar that would serve as a "quick links" section for the various forums. Ultimately, the first priority in my mind would be the news, so have a streamlined top bar, logo above that, and leave it at that so you wouldn't have to scroll too far to see the news.
Ultimately, there's one thing I think you should do with a main site: make sure the most important content is immediately viewable with minimal effort.