As mentioned on the SongBird website, "Songbird is a desktop Web player, a digital jukebox and Web browser mash-up. Like Winamp, it supports extensions and skins feathers. Like Firefox®, it is built from Mozilla®, cross-platform and open source." - what more could be asked for?
Its like the new iTunes, but with extended web browsing, and Firefox/Thunderbird users will certainly have either heard of, or experienced this program.
Another fact that makes this program seem all the more exciting is that it is still in its development stage, so surely only better things can come of this program. Already it is cross platform, open source, and has 'sexy features'.
I consider myself to be at the front of the online picket line urging people to stray from iTunes, and experience the next generation of music and web browsing. Web 2.0? You bet.