Andy,
It took me a bit to get to it, but I cloned and created a gh-pages branch so we could host the files on github. If you want to hack on this or change it up some more in the future, it's a good lightweight way to see your work. I know there's stuff to be done, but maybe you and some others can continue to look at some basic viz stuff using d3. It could be a neat project for a couple of people to work on and learn from together.
Next hack night is this next Tuesday. There will be a special presentation on Kinect hacks and natural user interfaces, but opportunity for folks to work on other projects if you want to explore this some more.
On a related note, I'm trying to get the Bikeshare data from BCycle and have connected with them, so maybe that's the dataset worth waiting for to do a viz project on. Also crime data is really robust and there are some static datasets that may be worth trying to visualize.