We love any decent web visualization that explains interesting trends or developments. This map, developed for Forbes.com, nicely illustrates the movement of U.S. residents to and from different areas of the country during 2008.

The link is  here.

The map takes some time to load initially.

By clicking on the county you want, the resulting black or red lines illustrate the relative flow of population, to or from that location.

Click, for instance, on Kootenai County to see where people there have moved from.

My only quibble is that it's not fully up-to-date. It would be even better to have a data map for the years 2007-2010.

The number of people moving out of rural Idaho increased between mid-2008 and mid-2009 as the recession reached into every corner of the state.