Local Motion Maps & Routes: Our friends at Local Motion have a great list of local bike routes.
Road and Gravel Routes
From our blog: "Six Dirt Road Rides for Burlington-based Adventures"
Adventure Cycling Association: Your bicycle travel connection. Check out their Green Mountain Loop and Adirondack Loop.
Cross Vermont Trail Association: Ride from Burlington to Wells River, VT, on the Connecticut River.
Mountain Bike Trails
XVT Bikepacking Route: It's elusive, but here are some resources:
XVT Mountain Bike Route (last updated in 2012)