Nasa's Astronomy Picture of the Day archive is a packed with awe-inspiring, high-resolution images of space that, incidentally, work great as desktop wallpapers. But NASA doesn't offer an easy way to grab everything. Command-line tool wget to the rescue!
Update: This post is primarliy meant as a good example of how you can use wget to save time, but if all you want is the images, I put together this torrent. Enjoy!
A little backstory: My wife is a graphic designer working on a project related to the Griffith Park Observatory here in Los Angeles. She was looking for high-res images of space, and I knew Nasa's APOD archive was full of great images-but grabbing them all isn't easy, and clicking through the archive is tedious. So I turned to wget, a cross-platform command line tool.
Find out more in the Lifehacker post Download the Entire Archive of Nasa's Astronomy Picture of the Day with One Command