Microsoft's ZuneHD is obviously an excellent gadget: small, beautiful and high-end. But the service is broken on launch day, making it impossible to access pretty much anything on a device that can't do anything interesting or new without this access. The marketplace is inaccessible ("Try again later") and my first two hours with it have been an exploration of "unknown" errors like C00D11CD, which could be a DRM failure, a full Zune, a full hard drive, or a network error (that's a bingo!)
I was able to get the Zune 4 software installed, at least, so am able to copy music to it that I already own. Sounds great.
Update: It's fixed! Things are downloading right now.
Update II: It's not fixed! It lets me see the apps and stuff and I can click "download," and it tells me its "100% downloaded," but then it changes its mind and says Can't Download. I'll click on some more stuff and see what happens.
Update III: At last! Apps are now IN COLLECTION. This stuff wouldn't be that big of a deal were it not for the fact that the service side is where the magic is. (Moreover, the ZuneHD doesn't do anything out of the box, not even appearing as a removable drive: it must be sync'd to a Windows PC first and updated.)