Kore Nordmann points out an article that he's written up about the new ezcGraph component as a part of the eZ Component system.
From the article over on ez.no:
Among the additions to the latest eZ Components 2006.2 release is the Graph component, which enables you to create bar, line and pie charts. The output driver mechanism allows you to create different image file types from each chart, and the available renderers make the chart output customizable from simple two-dimensional charts to beautiful three-dimensional data projections.
His introduction covers what the functionality of the component is, what chart types you can make with it (with code examples), and the options for customization it makes possible. He also includes links to a tutorial on its use and the API documentation for you to pick through.