Here's a program that will semi-automatically download album cover images for your music collection. All you have to do is point it at the root of your music directory and for each directory, the program will download a set of corresponding (well, best guess) album covers from the Internet, from which you can choose one that suits your fancy.
If you are using a non-English version of Windows, please do not use the current release of the program as there have been some reports of MP3 tag corruption.
Note that due to the latest changes in Amazon's Product Advertising API, Album Cover Art Downloader is unable to download any images from Amazon for the time being.
Currently supported image providers:
At least the following programs make use of the cover images:
In addition, some portable music players can show the cover image if it is embedded in the MP3 file.
The standalone versions are completely self-contained, and thus require no prior Python installation or any further dependencies. Just extract them to some directory and you're good to go. The standalone packages were made with McMillan Enterprises, Inc.'s excellent Installer. The Windows installer was made with InnoSetup.
In order to run the source packages you'll need:
On Debian the following command should get you rolling in a jiffy:
The cover images are in one or more of the following places: