The main index could be cleaned up or formatted. Maybe have a separate header grouping different subjects together, while keeping all the forums. For example:
GENERAL DISCUSSION
BIKE COMMUTING
Commuters
Capital Bikeshare
Capital Bikeshare Software Developers
GEAR
Bikes & Equipment
Maintenance
Classifieds
RIDES
Events
Group Rides
Where to Ride?
Family Biking
Freezing Saddles
Bike to Work Day
PICTURES & VIDEOS
ADVISORY COMMITTEES
Arlington Bicycle Advisory Committee
Alexandria Bicycle and Pedestrian Advisory Committee
Fairfax Advocates for Better Bicycling
If the index had these headers or groupings, all of the forums would still be visible on the main page, but they could be much easier to locate. General Discussion could remain at the top, and stay as an individual forum. Nothing would change except the arrangement on the index page (and moving Maintenance to the index). Instead of all the individual forum titles, someone can just scan the index and see a few general topics, followed by a few forums beneath each topic.