I just created a Cycling in Detroit article on Wikipedia. It's important missing information, but I think it's a good start. Please add, update, and correct stuff!
http://en.wikipedia.org/wiki/Cycling_in_Detroit
This could be an invaluable resource for all, but especially visitors [[including this summer's U.S. Social Forum cyclists.)
Also note that in keeping with the other city cycling Wikipedia articles, this article focuses only on the city of Detroit and not the suburbs or Metro Detroit region.
I am creating the "Greenways in Detroit" article next...
Todd Scott
Detroit Greenways Coordinator
Michigan Trails and Greenways Alliance
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