The new Hype Machine is brilliant, especially the way the whole page plays like a playlist. Here's what's in my Songbird sidebar at the moment - am I missing anything important?

Songbird now has ways for sites to interact directly with it, using the Web Page API: I haven't seen this in action anywhere yet...

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Try loading up this page in Songbird while you are playing a music track-
http://whacked.net/explore
Here's the original blog post-
http://www.songbirdnest.com/node/2173
The team is working on creating documentation and usage examples for the webpage API. If you like how Songbird integrates with websites now then you are going to love websites that take advantage of the new API!