D3 in Depth
Nice timing. I just found this website the other day and love it. I've just recently been getting into data visualization and have fallen in love with d3.js. Another good resources is http://alignedleft.com/work/d3-book/. Maybe a bit introductory for some of the smartypants on HN but I've been away from front end dev for a while and so find blasting through the chapters pretty helpful. Hilarious tone, also. Combined with d3indepth.com's examples and the API docs I've been able to get a good grasp of d3.js.