Fusion tables is a project that lets you work with sets of data uploaded from Google Docs spreadsheets, csv and .xls files. It lets you create charts, graphs and maps to visualize your data, filter data to focus on subsets of your data and even merge it with other publicly available data tables to create new data sets.
One amazing feature is the Intensity Map. According to Google description:
See the data on a map or as a chart immediately. Columns with locations are interpreted automatically, and you can adjust them directly on a map if necessary. Use filter and aggregate tools for more selective visualizations.
To see more information, you can go to http://tables.googlelabs.com/public/tour/tour1.html
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