Over the weekend I've been fiddling with the OECD Broadband stats to get them into a Google Spreadsheet and then be able to publish the results in their moving charts. I've also made a heat chart. It's not really perfect, but it shows the possibilities. One of the conlusions I do draw is that there seems to be a strong correlation between household PC usage and Broadband penetration. Unfortunately there are only limited numbers available for PC usage
I've found that the apps are not consistent in the way the work. A heatmap works with rows, a moving chart with columns. Also I'm missing tracking options to follow one particular dot (you can click them, but they don't leave a trail unfortunately.) You can find the sheet here.
If you really want to know how it is done, than have a look at http://gapminder.org/ or look at the Youtube movie of Prof. Hans Rosling, the inventor, at the end.