My vision says that Opera Unite isn't going to live up to the hype. Users don't want a music player in their browser, they want a good music player. Opera would do better to build a sturdy, dedicated server side JavaScript environment than to put a weak offering into their browser.
"Users don't want a music player in their browser, they want a good music player."
And, incidentally, iTunes already has sharing from within the player and it is very widely used.
Anyway, Unite is an interesting experiment, even though it probably won't revolutionize anything on its own. The "this will revolutionize the web!" PR sort of obscures the actually utility/novelty that this likely has for a subset of users.
