More bicycle related websites that you may find helpful:

American Bike Trails  - Books, Maps and Trail Guides

Kalamazoo Bicycle Club

Adventure Cycling Association

Union Cyclists International

Apple Cider Century - organized yearly ride

League of Michigan Bicyclist

Michigan Mountain Bike Association

DALMAC - Dick Allen Lansing to Mackinaw Bicycle Tour

Non bike related:
Skeletons and More!