Are you flying home for the holidays? You might want to keep this site in mind: it’s a quick, nifty way to get an idea of the delays into/out of a particular airport.
Flight Wait’s at http://www.flightwait.com/ . You’ve got two options for using this site. First option is to click the “Show All Airport Delay” link, and you’ll get a map with lines of flight delays — the lines are colored based on how late the planes are running. Or you can choose an airport code (or zip code or city name if you don’t know the airport code) and then get a set of lines for flights, again colored based on delay.
This is cool. It would be golly-bazooka cool if you could click on a flight line and get information about a particular flight, but that’s probably expecting too much.