I've been amazed at how easy it's been to get into reasonable shape by changing only one thing: consistently collecting the right data.
[2] http://mdlabs.se/sleepcycle/
[3] http://itunes.apple.com/us/app/nike-gps/id387771637?mt=8
(The answer is relevant to my own startup, http://beeminder.com which is a goal-tracking and anti-akrasia service -- you pledge money to force yourself to keep your data points on a "yellow brick road" to your goal. It works especially well when you can automate the data collection with devices like this.)
Thanks for this review!
The good people at Jawbone respect the integrity of babies' orifices, and would never dare to file a patent.