I've often wondered whether there are any patterns or cycles to my moods so I built a simple iPhone app that occasionally pings me to ask how I'm feeling on a scale of 1 - 10. I also note down what I'm thinking or doing at that moment and automatically grab my location. I use the data to show some basic statistics on how I've been feeling on average over the past three days, past week and since I started tracking. There's also a graph of my moods over time.I'd love to get feedback on whether people would find something like this useful. I'm curious about what other things people would want to track about themselves and interesting things to do with the data.
http://itunes.apple.com/us/app/moodtrack/id541505268?mt=8