The Zune 2.0 will be available tomorrow, as well as the upgraded software for the original Zune 1.0 and the new Zune software. One of the coolest things for the new Zunes is the option to get free laser engraved artwork and custom text on the back of the Zune.
Check out the details at Zune Insider and Cool Hunting.
Lots of other cool info at Zune Insider.