Sure it's designed for tablets and all, but I have a feeling Win8 might fall to the curse of the sucky "odd" release (Windows 3.1, Win98, XP and 7 were great! Win95, ME and Vista were terribad)
With this whole shift to ribbons and metro, I think I'll stick to Windows 7 (unless there was a way to disable all those bells and whistles).
You can grab a copy of it off Microsoft's official site.
Anyway, enough rambling. To disable the metro task "home" screen, either press "Win+R" to open up the Run dialog or open a command prompt.
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer /f /v RPEnabled /t REG_DWORD /d 0
Restart Windows 8 and you'll have rid yourself of that horrible tablet UI.