Polychart - A browser-based platform for exploring data and creating charts
youtube.com
youtube.com
We're trying to tackle this idea from the practical user perspective and theoretical perspective. There are a lot of things to learn from existing systems such as R, Matlab, Maple, Tableau, and Excel. We're also trying to incorporate a lot of ideas from the data visualization community.
We're still very young, I would gladly accept comments and feedbacks from HN community.
A small UI nitpik: one thing that struck me from the video demo was that your drag targets were on the opposite side of the screen to their source. That seemed a little less discoverable and more involved to use than if they'd been closer.