You just gave me an even more interesting idea! What if you had a service which automatically found data correlations?
Create a sort of Wikipedia of timeline-based data streams. Let people have both public and private timelines. Come up with some sort of clever way to do the N^2 comparisons and find interesting correlations. Maybe even provide people a framework to conduct experiments by influencing an independent variable.
If even a few cool results sprung up out of this, you'd see loads of people pushing their data into it from all sorts of sciences. Who knows what sorts of fantastic things we can learn from the collective intelligence?