I’m all into mash-ups lately, so I’m going to present one here that crosses a media jukebox and web browser (and one based on Mozilla to boot) called Songbird. It’s still in early beta, but it has a lot going for it. It functions a lot like iTunes, with the ability to play music from the iTunes store (though you can’t buy music from there through Songbird). However, it will sync with your iPod (haven’t tried it). It also is extensible like Firefox, and when you go to add those extensions you’ll do a double take and think you were in Firefox.
You can play the music from your computer’s hard drive, and like iTunes, it’s placed in the Library. The web functionality comes in by going to a web page or blog with MP3’s on it. Songbird will list the MP3’s it finds by presenting it as a playlist. You can even subscribe and Songbird will stay up-to-date. As I mentioned you can play MP3’s and iTunes music, as well as .ogg, .flac, and .wma. Songbird works for Windows, Mac, and Linux.