[Jade East]

Its early in its developement version 0.2.5 I just downloaded it for osx needs
a bit of work but its kind of interesting and does a few tricks that are cool it
will be interesting to see what it turns into and maybe it will offer some
better dsp, eq and sound better that itunes who knows? Anyways the price
is right check it out. http://www.songbirdnest.com/

[Watson]

If you're on OS X and into music blogs, be sure to check out Peel.  I think it's a better application than Songbird for that kind of thing though it may not always be free.