Charts are awesome. Making charts on the fly to share on the web aren't easy, however. Chartspree might just be the simplest, most versatile way to make fast charts yet.
To create a chart with Chartspree, simply modify the URL to alter the variables. so, for example, this URL:
Will result in this chart:
You can change the chart directly by modifying the URL. The service also offers bar and line charts you can customise. If you're not familiar with how to tweak URLs, this method might be a little complicated for you, but it's extremely versatile, and the savvy should definitely give it a look.