Reporter is a new application for understanding the things you care about. With a few randomly timed surveys each day, Reporter can illuminate aspects of your life that might be otherwise unmeasurable.
The biggest issue I have with these types of “quantified self” apps is the chore of having to input data regularly. Fortunately, this app reminds you to do this every now and again via push notifications. It also supports automatic measurements such as time, location, and ambient noise. Not bad.