Plottable.js (http://plottablejs.org/examples/) is another library that takes a similar approach: reusable components written in D3, and a table-based composable layout system.
I've been using Plottable recently and it's great. Hope it gets more widely used so there's more material out there about it - it's SUPER powerful but the documentation is hard to understand if you're really trying to extend it.
