Though perhaps more aesthetic than informational, the following are examples of creative visual interpretations of data from multiple sources.
Britain from Above
The BBC's Britain from Above provides visualizations of the airplanes, taxis, and lights as seen from high above the metropolitan cityscape.
Magnetosphere
Magnetosphere is an audio visualization program originally developed by the barbarian group, developers of interactive physical and digital artwork. Apple purchased Magnetosphere in 2008; it now lives on as iTunes' gorgeous built-in music visualizer: