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The Fitbit website actually does a relatively good job of parsing and displaying this daily data for casual perusal and offers a value added "personal trainer" service to take your data and guide you toward health goals. There are some nice provided charts which show the minute-by-minute steps/intensity as well as plots of sleep and floors of stairs. The interface is relatively intuitive and allows modifying date ranges and sharing your aggregated data to your friends on the site. Unfortunately, if you're t
Fitbit offers a simple API service which registered developers can make use of to grab quite a bit of user information, but the best bits like intraday step and intensity data are restricted from everybody but the Fitbit partners. Fitbit partners you say, well I'll just register as one of those in that case! Wrong. It is not currently possible to register as a partner directly as that option is only available for large partner companies.
I found this somewhat unfortunate as I thought I was purchasing a well engineering piece of hardware to acquire data for me, not exclusively for partners of an Internet company. This seemed even more peculiar since the five-minute data is available in the graphs on the web interface. Fortunately this means that there must be some API call to refresh the graphs on the beautiful AJAX pages as we select among the different days.