It would probably be worth switching if it wasn't just a rebranded Hotmail finally doing what GMail has already been doing since the dawn of time.
Be serious, it's not a rebranded Hotmail. And at least it doesn't have a crappy compose window...
I can sense your anti-Google stance immediately there so I won't feed the trolls but if it's not a re-branded Hotmail, what is it? It's hardly a groundbreaking new concept. (Also, you can switch off the stupid compose window so where's the issue there?)
I can sense your anti-Microsoft stance immediately there so I won't feed the troll, especially one in reality-denial mode.
Also, while you can switch off the stupid compose window now, soon you won't be able to....
Outlook/MSN <--> Google chat interoperability means XMPP is alive and well on the Live Messenger servers right?