Demographers nationwide are probably rejoicing at the recent release of the first five year American Community Survey data. Several news stations in our area have headlines related to it. What's the big deal? For many years, the U.S. Census used two surveys in it's ten year survey. The first was the "short form," which gives basic information on all residents at a given location. The second is the "long form," which provides much more in depth information on things like commuting habits, education levels, employment sectors, household types, and so on. Only a few households got the long form, but the Census folks just did the math to calculate stats for a whole area.
The problem was that after a few years, that ten year data gets a bit stale. Chances are a neighborhood might look much different in 2009 than it did in 2000. And so beginning in 2005, the Census replaced the long form with the American Community Survey (ACS). (The ACS is also cheaper than the long form, but that's neither here nor there.) The ACS is done every year, but at a less intensive scale. So for any given year, we only got stats at a very broad level, like a single major city. But with time comes more precision. This recent data combines five years of data and gets down to the census tract level, about the same as zip code. It's averaged, meaning it's a snapshot over that whole five years. But it's better than the 2000 data, and from now on, it will come out every year, meaning that we'll have a better sense of how areas are changing over time.

I've been playing around with this data a bit and thought it might be helpful to post some maps of it here. Below is a map of the Twin Cities area, including several major racial/ethnic classifications and the median family income. On the left is a snapshot of income, for example.
An interactive version of this map is
available here, through the GeoCommons site, where you can click on and off various layers to compare, zoom to specific neighborhoods, or click on tracts to get exact data.
Depending on my time over break, I'll try to post a few more of these maps or possibly some basic analysis (correlation of race with income, for ex.).