Agreed on DC - the places that I plugged in from northern va. (22102, 22213, 22046, etc.) all seemed to be showing the best-case times. Some places that it says are a 5-10 commute are more like 30-45 minutes at rush hour.

Also, not related to the commute times, but the crime rates look strange. At least, it's showing Arlington, VA as almost completely red (very high crime). Maybe the data is right, but that would be surprising for one of the richer, more yuppified areas of the US.