[gerpsh]

If you're using more common visualizations (e.g. bar chart, line chart, scatter plot, etc) there's an excellent js library called C3 (http://c3js.org/) that wraps charts implemented in D3 with a super-simple api. I'm a huge fan.

[colordrops]

I did a lot of test plots with several D3-based charting libs, and found weirdness with C3, such as performance degradation over time, and oddities like including the label for the data as the first entry in the array. NVD3 seemed to be the most mature and sensible of all the libs I tried. http://nvd3.org/