Hah, I finally caught up with this branch gone wild here. So far my favorite line is from @e_ramires: "Hell, life is f'in hard."
So, I'll add a few of my 2 cents back to the original prompt and my blog post Behavior Change is Identity Change, Who's Building an App for that?: smallstepslabs.com
I've started to categorize apps I see in to basically 2 categories
1) Apps that help people resolve the identity they have already adopted / the change they have already made but are working to realize
2) Apps that try to steer the user in to taking on a new identity trait.
Sometimes apps are a little bit of both, but it's really hard to be good at both at the same time IMHO
For example, @RunKeeper falls in to #1, @DailyFeats mostly in to #2