Cover Fetcher downloads album artwork from last.fm. With it, you can:
drag album covers directly to your desktop, iTunes, or your favorite graphics program
copy album covers to the clipboard and paste them into other applications
save album covers to disk in BMP, JPEG, or PNG formats.
Cover Fetcher has no bloat, no tricks, and no bells and whistles. It runs on Windows 2000 and higher, and is released as free software under the GNU General Public License, version 2.
Or browse source code and old releases on SourceForge.net
Please note that Cover Fetcher is not affiliated with or endorsed by last.fm.