This is just a nice querky site to have a play around with. I don't how useful it might be scientifically, but it sure is aesthetically pleasing!

http://workshop.chromeexperiments.com/stars/?ModPagespeed=noscript

It is quite interesting to see the temperatures of the different spots in the universe ('Take a tour' on the top left).

I think I found this through the QI 'Suprise Me' link: http://qi.com/