[allertonm]

This is similar to how we do our email delivery of dashboards at Indicee (http://www.indicee.com)

We don't use D3 for our visualizations (I'd love to, but our users can use the dashboards "live" and, well... Internet Explorer 8) and we snapshot the entire dashboard - which isn't quite as clever as what is done here, but does have the advantage that the resulting mail is self-contained and does not require the dynamically generated images to be hosted somewhere.

Like these guys, I have nothing but good things to say about PhantomJS. We'd previously used another "headless webkit" - wkhtmltoimage - in a similar role but Phantom's design as a general purpose scripting engine for headless browsing tasks is much, much more useful.