Uhm, this is happening to me as well on a brand new 80gb classic.
I have a few of the conditions that some people mentioned. and it only happens on one PC not the other.
The Ipod has 1.1.2 firmware, the latest build of MC on both PCs 12.0.449?
One PC I have admin rights, USB 2, and the ipod ejects properly when I select eject from Media Center.
Bad PC, syncing with no admin rights, USB 1 and ipod does not eject when selected on MC, However it does eject properly from the system tray applet.
MC sees the music but The Ipod does not, and Itunes does not see the database afterwards.
If I then go to the good PC and sync another song everything is "fixed" except for scrambled artwork.
The interesting part is that this is only happening with the brand new ipod on the "bad" PC. we can sync two other ipods (old 60gb g5 and 160gb classic) just fine (except for the Eject problem).
There is something odd about the new 80gb classic, and the bad PC. I suspect it's the eject\usb 1 issue... and that it is not closing the database properly although it does says it's complete.
Do the others having problems have any of these conditions?
USB 1
Non-Admin Rights
Not able to Eject from MC directly?
by the way I tried formatting with Both Itunes and MC and nothing worked. The Ipod is simply not usable with MC on that one particular PC.