The Good and the Right chart to represent data.

To communicate a large amount of data & insight at a glance, the chart is the best choice.
Most often we find the charts incomplete and can not communicate as intended.
The other we often encounter is using an inappropriate Chart for the data.
Here are two presentations to bring you vital elements to make a good chart and the Right Chart for data.

Both are  DOCOMO Stuff  @Downloads
Download, Copy and Modify at your will.

In addition, there is a link to a simple and wonderful Presentation from Chandoo. 
Which Chart by Chandoo 
Here is another masterpiece. a white paper on Communicating Numbers. Communicating Numbers.