I don't think that's quite how it works. I took a quick look at the code and it doesn't contain any DOM selectors at all. It uses closures and getters and setters.
Different. Nike+ is more about exercise and sports motivation, Withings is more about the data. I feel inspired to workout with Nike+, Withings just gives me the data I want.
I'm using a JawboneUP to track mood, steps, calories, and sleep. And the Withings Smart Body Analyzer to track weight, and heart rate. And a few open source gems to pull down the data: https://github.com/chocolit/dashboard
This looks great! The monitor feature looks interesting. We used node-usage for a while but it seemed to eat up a lot of memory. Maybe I could take a another look into it.