Google Chart API

google chart api - neat free way to produce charts and graphs. No API key needed.

- Hello World example
http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World

- java wrapper for the google chart api
http://code.google.com/p/javagooglechart/

- api explained
http://code.google.com/apis/chart/