Thanks first to our small but helpful commentariat. Just because your suggestions have not been acted upon does not mean they are (entirely) without merit. We have been busy actually updating data and running regressions. Expect more substantive posts soon, but, in the meantime, please enjoy an updated version of the previously posted violent crime map as well as a similar one for property crimes. You will note that I replaced the green color with tan to make it more intuitive (and visually pleasing). Again, lower ranked areas have less crime.
Update (12/14/2008): Minor corrections made to violent crime map. 7 Community Areas move up or down one category from previous map.