Earthdesk
Whether the standard wallpaper options (picture of your pet, swirly thing) bore you or you just like having a global perspective, Earthdesk takes your desktop to the next level by making it into a constantly updated view of the earth. The app uses geographical and time zone stats to create a customizable, info-rich image.
The most striking part, of course, is that Earthdesk provides a visual of time passing, with accurate shading delineating night, twilight and daytime. It also (seemingly almost magically) shows real clouds, light emitted by cities and moonlight (which can be adjusted to show more or less city light). Other customization options include political and natural views, as well as the ability to lock the map to a city, the sun or the moon to get a different perspective. We don't say it a lot around CH, but this one is truly awe-inspiring.
