How to Choose the Best Chart for Your Data
lifehacker.com/5909501/how-to-choose-the-best-chart-for-your-data
What Jamie wrote
Good article, worth it just for the hilarious header image.
When you're putting together a chart, you're trying to show one of four things with the data you have: a relationship between data points, a comparison of data points, a composition of data, or a distribution of data.