Looks like Google released a very cool looking Chart API. Seems pretty easy to use. You just make a call to their API in the image src attribute passing the API some basic parameters and a PNG graph is embedded in your page.
There’s several types of charts available:
- Line Chart
- Scatter Plot
- Bar Chart
- Venn Diagram
- Pie Chart
The API is fully documented and instructions can be found here.
Below is a real basic example of making a call to an image on the page:
http://chart.apis.google.com/chart?
chs=200×125
&chd=s:helloWorld
&cht=lc
&chxt=x,y
&chxl=0:|Mar|Apr|May|June|July|1:||50+Kb