So, I wonder if people would use apps to track their time trying to enhance their productivity. I definitely would, so I’m planning to build an iPhone app that basically tracks your “time-spent” over a period of time to hopefully give you a bigger picture of what you’ve been doing over, say, a week. That should, aggregated over time, and presented with a decent enough UI (read:mint-like), give you enough data / perspective on what you’re doing to make meaningful decisions. You could maybe even A/B test yourself and see what types of choices “work” and what don’t.
Correlate this somehow with the mood at the time you’re doing this, you hopefully should have something of value.