The City of Madison and the Madison Parks Division are in the process of gathering information to update their Comprehensive Plan and Parks and Open Spaces Plan, respectively. These are both documents that being included in would be very beneficial to expanding local off-road cycling opportunities. There will be a variety of opportunities to offer your input; go here
http://www.madcitydirt.com/index.php?topic=3623.0 for discussion or updates.
Currently there are a couple surveys you can respond to (details in the above link), and public meetings on Dec 5 (downtown) and Dec 7 (southside) (details in same place), with more to come. We'll keep you posted.