Small suggestion - I would rephrase the "Competitor electric vehicles, and why the Nissan Leaf Electric Car is superior." text that is under the "Nissan Electric Car Competitors" forum. I understand that almost everyone reading/contributing to this forum are enthusiastic about the Leaf, but that doesn't necessarily mean that the Leaf is superior to all other options. Even if someone could argue that that's true right now, it won't always be true. It also sounds like it's just asking for flame wars.
Additionally, you might want to expand the scope and just change the category to something like "Other Electric Cars" -- Nissan itself plans to be offering more vehicles than just the Leaf, and I'm guessing some Leafers will want to talk about those cars as well