Well, we've been utilizing the Thread Rating function to pretty good success over at the Tutorials forum, and its helped prompt more and more tutorial development which is a HUGE draw to the site.
This thread rating system is actually quite helpful for other reasons as well...For example, as of now, the community leaders keep an eye on the Finished Maps forum and choose maps to feature based on their own personal opinions. But you, the guild members, can help "influence" their decisions by rating Finished Maps threads in this forum the same way we do over at the Tutorials forum.
Just click on a thread, and up at the top portion of the thread right there to the right of the original post of the thread is a Rate Thread menu. Click it, and be honest in your ratings. Don't just go around throwing 5's around. I'd like to see all the finished maps get rated.