I've always been a big fan of song covers that not only re-perform the original, but to some degree change the atmosphere or even transfer the song to a completely different genre. Blue monday, feeling good, mad world, sweet dreams or my way would be good examples.
Last.fm has turned out to be a great source of cover versions I hadn't heard yet and don't have in my MP3 collection. Some were horrible or boring, but some were really cool, so I finally started to make good use of the tagging system and created a personal station…