FitBit
I‘m looking forward to using FitBits, hopefully to track the amount and quality of sleep I get. FitBits, unlike the Nike+, can communicate with Android devices over Bluetooth. The extra convenience of being able to see my data in real time on my phone, rather than waiting to plug the Nike+ into my laptop, will likely promote better habits in the short term.

Ask Me Every
This tool seems like a quick & effective way to track my habits, if I promise to respond in a timely manner. I would probably use this to track how often I cook my own meals, since they’re much healthier and cheaper than the takeout I came to rely on last semester.

Facebook
Facebook is the preferred means of casual conversation among my friends, family, and classmates. Why not look there for data? In particular, the graph API looks promising. It would allow me to download JSON data about my Facebook friends, which I could then sort to form patterns.