Script Summary: Adds links to the left sidebar on Last.fm artist/song/album pages. By default, links to Grooveshark and The Pirate Bay searches. Source file can be (somewhat) easily edited to add more searches.
Update 5/6/09: fixed a problem that came with a new change to Last.fm; also, improved the way the script grabs the artist name and song/album titles to attempt to prevent issues like this from happening in the future.
Update 2/27/11: remembered this script existed, updated to work with new Grooveshark site and added a Google search link. Also updated comment "documentation" in the script itself, and changed the license to Public Domain.