I think I am gonna remove the side menu links, go with a top frame using a flash navigation (main links with sliding sub-menus.)
I have a design in the works for the standard page, and once I get something going with that I will look to get a database setup for your themes and to track new members.
Not sure how invisionboard handles usernames and pw'ds but I will check into that to see if one account can automatically create a new forum name too.
Once this is set it should be fairly easy to reconfigure themes.
We will need to talk about consolidating some of the info on these pages and also make the download sections managable.