I agree, don't know of such a site. However, by using these two websites you may be able to get a rough idea.
http://www.oakgov.com/equal/ to get the 2009 tax rates
and Trulia Stats and Trends to get the average value of homes sold
You may also be able to use the State of Michigan Treasury website http://www.michigan.gov/taxes/0,1607,7-238-43535_43540---,00.html
Wish you luck