Suggested Topics Tweak
Maybe you could make the suggested topics box not show any topics you have viewed, cause its the best way to browse the forums and it gets a bit annoying when I see the same topic 3 times.
I'm not even sure how it chooses them, it's a public plugin. I'm still working on the sidebar. Right now I'm trying to figure out an issue that won't let me create any "Featured Topic" widgets which is the main priority because I want to feature the FAQ/Rules posts permanently for new users and then feature random things that I deem to be quality content as I go. Such as people making free skins, etc.