Moritz Stefaner and I gave a tutorial at this year's IEEE Visweek in beautiful Paris. In 'Everything except the chart' we summarized everything we've learned about how to develop complex, web-based visualizations - except how to build the charts themselves. We've talked about things like our development process (Coffeescript, SASS, grunt, etc.), how to social media, and how WebGL is the hottest new thing out there for 3D piecharts (irony is hard on twitter!).
Anyway, you can find our code examples here and the slides right here (click to focus and navigate with arrow keys).