I have used GoogleChart in VASmalltalk to create a nice graphic about the usage of the site in terms of down- and uploads.
One thing you should keep in mind when working with GoogleChart is that the x-axis labels will be positioned on a 0 to 100 scale independent of the data you provided for the chart. So you have to figure out where your labels need to be positioned yourself and do some math to determine where to place your labels.
Now go over to VAStGoodies.com, click on the statistics link and take a look yourself! Or, feel free to upload some nice goodie yourself 😉