I'm sure allot of you track your flights at
http://flightaware.com/ and you can even have tail # emailed, AOL, Jabber, and mobile devices alerts when flight plans have been made and are in the air. This is really cool following the rich and famous such as Travolta's Quantas 707 # N707JT, (above) or Oprah's GV # N540W. Just thought you might be interested if you get an alert you can jump on LiveATC and listen in. Some of the stars can decide to have their tails blocked from tracking such as Tom Cruise and the Greg Norman/Arnold Palmer company.
