http://lognormal.com/blog/2012/08/13/analysing-performance-data/
Mirror of the same bluesmoon / lognormal blog post on analysing performance data.
http://www.speedawarenessmonth.com/analyzing-performance-data/
Blog post from bluesmoon / lognormal on how to analyse performance data. Includes some great points on geometric means and geometric standard deviation which better apply to lognormal distributions than arithmetic means / standard deviations. Very useful.
http://square.github.com/cube/
Cube is an open-source system for visualizing time series data, built on MongoDB, Node and D3.