Beeminder and Lift.do have very different approaches to habit formation; both have strengths and I have found the benefits to be pretty much orthogonal to one another. Some may think of them as competitors, but I hope they think of each other as siblings. :)

Lift.do motivates me to consistently track habits that occur several times each week because of its attractive design and ease of use. The motivation and learning that results from the its social aspects (comments; props; notes) also keep me coming back to the app.

HOWEVER, the habits/data that I generate with lift.do would be much more powerful if I could (1) attach habit contracts to those activities and (2) track progress my progress against those lift.do habits in Beeminder where I already automatically pipe in data generated by withings and runkeeper.

In other words, I would love to use Lift's iOS app for input of my "daily" activities: priority setting, healthy eating, exercise, foam rolling, and decluttering. It would be awesome if that data automatically fed into beeminder graph and commitment contracts!

I suspect others might feel the same way! :)