If you are interested in astronomy, I’ve been playing around with a free program called WorldWide Telescope. Instead of trying to describe it myself I’ll just quote from the program website:
The WorldWide Telescope (WWT) is a Web 2.0 visualization software environment that enables your computer to function as a virtual telescope—bringing together imagery from the world’s best ground- and space-based telescopes for the exploration of the universe. WWT blends terabytes of images, information, and stories from multiple sources into a seamless, immersive, rich media experience delivered over the Internet. Students of all ages will feel empowered to explore and understand the cosmos using WWT’s simple and powerful user interface.
The mission of the WWT is twofold:
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