Oh the Zune team excels in dodging that tax, joe. (Cue mini-rant)
When released, the Zune software was not compatible with Vista and took about a month to become so.
It took a year to enable support for recorded tv from media center.
Still will not sync through Media Center interface.
When plugged into the xbox, does not provide any additional benefit beyond other media players, unless you count the icon.
Purchases from xbox marketplace will not sync and does not count as a purchase in Zune Marketplace, and will take the Zune Video Marketplace to bring that up to par, three years after launch.
I am still trying to convince myself that this is a Microsoft product, because the integration just isn't there.
That being said, I am excited to see what the HD brings with Zune 4.0 software and hopefully better integration into the ecosystem.