ToyotaNation (
www.toyotanation.com) just started a TCH forum. You can access it via the "Forums" tab, then go to either the "Camry" board or the "Hybrid" board. So far the traffic is pretty light, but Toyota enthusiasts of all stripes tend to gravitate to the site so I'd expect the discourse to grow exponentially over the coming weeks.
Don't get me wrong, I think GreenHybrid is great, but as they say, the more the merrier!