Google now offers a Public Data Explorer. This is another progressing Google Labs Project that looks quite usable yet. The datasets include, among others, minimum wage in europe, world development indicators etc.
Such public data visualizations are good examples of what can be achieved by information visualization. Such as, this small and easy created visual comparision of Agricultural land between the World and Austria lets users quickly examine that Austria’s agriculture is decreasing while the world’s one is still rising.
But have a look for yourself and create your own visualizations. 🙂