Musical Solar System - based on real orbital frequencies
HubbleSite - Wallpaper
The wiki is the place where stellarium users maintain all the knowledge about the program, and where you can contribute as well.
Chromoscope - View the Universe in different wavelengths...
Ever wanted X-ray specs or super-human vision? Chromoscope lets you explore the entire sky, including our Galaxy (the Milky Way) and the distant Universe, in spanning the electromagnetic spectrum: gamma-ray, x-ray, visible, hydrogen α, near-infrared...