Cubism.js: "A D3 plugin for visualizing time-series data".
Cubism can pull stats from graphite to produce pretty dashboard monitors. It is built on top of d3.js : Data-Driven Documents.
We're slowing putting stats into graphite at work. It'd be great fun to find the time to play with something like this , even better for someone to build me something shiny. Any takers? :)