Songbird. While there is no release available yet, check out the blog for an intriguing glimpse. From what I can see, it looks like an overdue re-think of whole idea of media players.
My “Songbird in five words” precis: The world is your playlist.
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i have high hopes for this product. one of the key contributors i knew from yahoo, jonathan, is extremely talented, bright, and generally “right thinking”. something like this is exactly what i would expect people of his calibre to produce.
XUL is the next big platform. gecko is the JVM of the next generation of portable apps. flock may have been a failure, but its also a demonstration (along with songbird) of where this platform can go. we are just at the beginning of what people will do with XUL and other mozilla foundation apis.