Move the marketplace down... Let's face it, it's a joke. Hardly anything decent sells here, and it just doesn't encourage people visiting the site that some random proxy is being sold for 10$.

Move up the discussion forums & maybe up the design critique aswell, they used to be very popular forums but by moving them down, nothing interesting happens. If you put the forums that used to be best down, where nobody goes (I hardly doubt new members scroll all the way down to partake in a discussion), there will obviously be lesser (interesting) posts.