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It is an active point of research, but the problem is the feedback. It's hard to get metrics people can't fake.

Inasmuch as body weight is one of those unfakeable metrics, the weekly Weight Watchers weight-in (note that you pay less if you weigh less) is an example in this area.

That could be an interesting startup; maybe coupled with a to-do list or a calendar or some such productivity tool. Maybe giving the users some "free" perk randomly whenever they advanced upon some self-set goal could work.

we're working on it. i'm working on it. one of the reasons i took notes on this is because my next web app will be self-improvement that leverages these principles

mindvalley has some great starts, e.g. gratitudelog.com

there's already http://mindbloom.com