Arlo clued me in to Rescue Time - a bit of tracking software that lets you know just how productive you are being throughout the day. As a background app it sniffs your current active application window or browser address and reports that to your account. At the end of the day you get a charted representation of just how much time you spent doing Productive Things vs Goofing Off (though in much nicer terms). It's a bit Big Brother in a way but since it is self imposed it has some appeal.