At least some of the new Wave 4 web services are now live, both here in the US and in Australia, at least:

Apparently Hotmail hasn’t made the switch yet, but you should be able to get to Wave 4 goodness from www.home.live.com, and access all of the new Office Web Apps, including OneNote, and Profile, Groups, Spaces, and SkyDrive.  We’ll have lots more soon, of course, but wanted to get a quick post up to let you know to go and check it out!