"Motion charts" - Data animation tool for Google Docs

You may have seen (and wondered at) some of Hans Rosling's talks, in which he uses Trendalyzer (the Gapminder Foundation's data visualisation tool) to draw conclusions from complex time-series. Last year Google bought Trendalyzer and some or all of the team that designed it joined Google. In the last few weeks Google seems to have implemented the tool - now renamed Motion Tool - along with a couple of others - as standard components of Google Docs. The addition of these features begins to differentiate Google's spreadsheet from Microsoft Excel in a particularly profound way, as you will see if you look at this sample spreadsheet and motion chart.