Desktop Earth is a wallpaper generator for Windows. It runs whenever you're logged on and updates your wallpaper with an accurate representation of the Earth as it would be seen from space at that precise moment.
Images are created from high-resolution textures (2560x1280) so it's perfect for that QSXGA display - but they work on anything, even on SVGA.
There is an image for every month to accurately depict snow and foliage changes, and the night view is simply stunning.
The imagery is based on NASA's Blue Marble Next and Earth's City Lights.
This is for Windows only. Desktop Earth will sit in your systray, run whenever you are logged on, and continuously update your wallpaper with an accurate representation of the Earth. There is no limit on the resolution, and the imagery is calculated from high-resolution 2560x1280 textures, so you can go wild with it even on 30" flat panel displays. Multi-monitor configurations are also supported.
Download and Changelog
6 Megabytes to download, ~40 Megabytes after installation. Tested on Windows XP 32 and 64 bit versions. Should work on older Windows variants as well.
I tested it on VISTA x64 and it runs fine.
Highly recommended
