Here is a great video, describing viridis, the new default colourmap for matplotlib in the programming language Python. This has some great features – It’s perceptually uniform across its range, it’s pretty, and it works for the colourblind. Oh, and you’re free to use it.
The last five minutes or so describe the process and thinking behind the new colourmap, while the first part of the video is a great description of background colour theory. Many thanks to Nathaniel Smith and Stefan van der Walt. Ed Hawkins has already plotted up some UK climate data, comparing viridis with other colour maps in a simulation of colourblindness. Kevin Anchukaitis (@thirstygecko) has put the colourmap for matlab users up here.