Peity is a lightweight (2.4kb minified) jQuery plugin that creates mini pie, bar and line charts in any browser that supports canvas. In legacy browsers that do not support canvas, the figures will still be displayed instead.
The size and colour of the charts can be customised in the configuration options and some types of chart have extra options.
Plenty of examples are provided, however this plugin is very simple to use. The charts can even be updated dynamically.