This is an interesting look at an evolving and rapidly growing trend in the art world. Data is the new medium and along with enabling an innate desire of self-expression, artists are helping scientists see their research from new angles. Great read, with lots of linked references.
Along with being an AI researcher at the University of Pennsylvania, Randy Olson leads the largest online community dedicated to data visualization on Reddit, /r/DataIsBeautiful, which serves over 2,000,000 unique monthly visitors. This isn't a long AMA, but there are some great answers here, which has inspired over 8600 views so far. You'll find tips for getting started with data viz, common mistakes to avoid, and lots of worthwhile links.
Anyone interested in market analysis will definitely want to check out this new D3 library. Components include Bollinger bands, candlestick series, moving averages, sparklines, relative strength indicators, etc, etc. This is well documented with examples. It's great to see libraries like this being built with D3. This is super useful!