Neil mentioned to me that Google just released a charting API. I decided to check it out today and was very impressed - I didn't expect it to be completely URL-based!

The tinyurl below converts into a very, very long Url, and it's just too long to paste in here. But if you click on it you'll see all of the text-encoded data that supports the chart data, which generates the chart below.

http://tinyurl.com/6z26s7

The data above represents the gas mileage for my Honda Accord over the past few months.

But the Google charting API... it can do quite an array of chart types and styling that is pretty impressive. Its documentation and details can be found at http://code.google.com/apis/chart/