I have the Lumia 800 plus Windows 8 Beta on my tablet. It’s neat how it works together… a lot of the contacts, office files, and skydrive content is shared pretty seamlessly. It makes the tablet like a big phone almost. It’s the beta, so some parts are disabled, but looking forward to upgrading.
PS I love the Lumia 800 hardware and Windows OS, some of the nicest stuff out there imho