I was busy most of today working on a book proposal, so I'm going to hand you a Sporcle quiz.
Unlike most Sporcle quizzes, you will have unlimited time to do as much of the quiz as you are able. On a Flash attachment, you'll be linked up to Google Earth and shown a map of the 1,000 largest cities in the United States. Your task is to name as many of them as possible. As you progress, you'll be given codes marking your progress. You put in those codes and you'll see what milestones you hit. Only the part where you fill in the codes is timed, but by then, you have them already.
For me, I managed 276 cities adding up to 55.5% of the total population.