Just over 1400 miles of driving in 6 days, without fights or even significant complaining from the kids. They spent a lot of time watching Anime DVDs (Full Metal Alchemist) on a laptop. We stayed four nights with cousins who have two year old twins (and a five year old)--I don't know how they do it.
Our travels went very smoothly, from picking up my daughter at the metro after visiting Goucher College in Baltimore with my son to driving through Washington DC (on Rock Creek Parkway) to avoid traffic on the Beltway Thursday morning to stopping at the North Carolina welcome center and getting a great price on a motel in Greensboro. Of the colleges we visited the later part of the week, we were particularly impressed by Mary Washington.