Kai,
Hey there! Great site you've got here, but I just wanted to offer a small suggestion that I've seen at quite alot of other forums.
Could you put a "General" forum at the top of the forums listing where people who don't have a post that fits into a particular forum can place posts?
One reason for this is that if General is at the bottom, it may very well never be seen even if it has new posts in it as many people have a habit of not scrolling down. If they don't see something interesting the first few rows, they are done and onto the next website.
Either that or a way to re-order your forums after each new update of a thread is made so that the latest activity forums appear at the top.
Other than that, YOU ARE THE MAN! Keep up the great work!
mgiusto