"Ever wonder how often you get busy?" Well, no - it's not the sort of thing I just oops forget about.
Based on the screenshots on their homepage (I didn't sign up as a Beta tester), you enter the date of the doing-it, the duration of the doing-it, the partner in the doing-it, and some "descriptive tags". Descriptive tags!!! You also get a personalized calendar, color-coded based on some value - perhaps length of time? Satisfaction? Position? Location? Partner? (Bob is dark red, John is light red...?)
But there is something appealing about the quantification of scrumping.