Peel is a MP3 blog reader and player for Mac. You can use it to subscribe to MP3 blogs and then download songs automatically when new music becomes available. You can also just stream the music. Peel is public beta at the moment. Other features include full iTunes and Growl support. A Windows version might become available in the future.
If you like it as much as I do, this just might be the best Icelandic made application ever!