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
I don't know of a place that shows you average property taxes. I have a link on my site that shows millage rates for those communities. That is the rate of taxation that is used along with the estimated value of the home to determine taxes. That will give you a guide as to which community has the lowest tax rates. Remember though, that property values will vary in these communities too.