As someone who spends most of his working day hanging out on various photography and motorcycle forums... You should keep the main discussion forums at the top and obviously titled, and the more forums there are, the less activity they will attract.
I know im a newb, but you did ask for opinions.
1. Site Info
2. Other Discussions - Remove "Other Systems"
4. Lenses and other gear - add "Other Systems"
7. Members forum
8. S & S
It seems to me that site info obviously should be first. Second, it appears that the open discussion seems very active. I think its a coin flip as to what comes next, photography/video or cameras and related gear? I think members only stuff and S&S should go last, especially S & S
Yes. I think the first set of topics should be about the gear itself, followed by the image threads. Because there is so much happening with m4/3s, I'd guess that most people would be interested in what it offers in the first instance (newcomers as well as seasoned veterans). The photography section shows what people can do with the gear, but it's at a much more subjective level.