I'm reluctant to put up any form of message board system until there is a critical mass of discussions on a general mailing list and, technically, until there is a way to combine blog, message board and mailing list content so that it doesn't matter which mechanism you prefer to use.
E.g. mailing to the list results in a blog posting as well as something put into the message boards hierarchy .
It's apples and oranges as to which interface people are going to prefer using, depending largely on your intended and actual use.
Below is my initial hack at a structure, .comments pls
GENERAL
About the MOD Films network
About MOD Films
Announcements
FAQs
MODS
Ratings
Reviews
FILMS
Ratings
Reviews
EVENTS
Live mixing
GAMES
Ratings
Reviews