Google has released a chart API that returns PNG files from an HTTP GET. The following types of charts are available:

• Line chart
• Bar chart
• Pie chart
• Venn diagram
• Scatter plot

The chart to the right was created using this URL:

http://chart.apis.google.com/chart?
  cht=p3&
  chd=s:Uf9a&
  chs=200x100&
  chl=A|B|C|D

Adding charts to Web sites just got a lot easier.