Stephen Downes

This is pretty neat. Do a search. A list of your selected artists shows up on the left. It also makes 'discoveries' for you; be sure to explore. A player shows up at the top right, and you can listen to your audio as Flash. An MP3 download link is also available. Meanwhile, in the bottom right, you are creating a playlist. Send the playlist friends by email or embed it in a blog post, like this:
And voila! My 1980s playlist (much less punk than you might imagine). (If you are reading the email version, the embed is not available due to email client restrictions - click on the title and see the web version). There are still some bugs with the interface, which looks a lot like RSS Writr. And still some speed issues. But it's great stuff.