If you don't track your time, I suggest you do. Knowing there's a record of what I'm _really_ doing each day pushes/inspires me to make that record a good one.

I started out using Harvest, but since I'm less interested in 'what project(s) did I work on today' and more interested in 'how productive was I today?', I've switched to RescueTime.

RescueTime isn't new (YC 08) but they do have an updated interface, so it feels much better than the first time I played with it years back.

Pro-tip: I created a Fluid ssb pointed at my RescueTime dashboard that I then pinned to my menubar, so I can check my stats anytime. Here's the icon that makes it look good: http://bit.ly/1bhewsA