Links: Astronomy Picture of the Day
Astronomy Picture of the Day ("APOD" for short) is a neat site provided by NASA and Michigan Technological University that features a picture related to aeronautics or astronomy each day. The images are captioned by an astronomer with many hyperlinks leading you to various interesting sites, both technical and whimsical.
APOD has shown everything from sunrises over the Himalayas to tornadoes in Kansas to supermassive black holes. Many of the pictures make great desktop wallpaper, and most give you an inkling of just how stupefyingly large the universe is. The site has been running for over a decade now (how many websites can you think of that can say that?) and, when something noteworthy happens (Huygens probe landing on Titan, for example) you can be sure APOD will have a neat image or animation to accompany it.
And you thought your tax dollars were going to waste ;-).