FORCers, check out the 3, 6 or 12 hour race at John Muir in Wisconsin:
http://www.wemseries.com/index.html
This sounds like a blast (well, the 3 hour does to me). John Muir is a really fun place to ride. It's in the Kettle Moraine State Park. Thinking about participating but have not yet talked to my beloved about it. In addition to the registration fee is a required vehicle sticker and a bike trail pass. Government has got its piece of the pie!