One of the fun and useful things we've been able to do in Expectnation with the personal scheduler is to use the data to help us as organizers.
We recently added in dynamic overlays to the organizer's view of the schedule, enabling us to create heatmaps of the most popular talks.
Screenshot of personal scheduler popularity overlaid on event timetable
As well as satisfying natural curiosity, the heatmaps let us identify issues such as possible room overcrowding in advance.
We're able also to record actual attendance figures as the conference goes on, and I will try and make an analysis of how attendees' intentions stack up against their actions.