Along with the manual (in both web/html and PDF format), Nokia UK have a bundle of support information ahead of public availability of the 800 on November 16th.

There's also confirmation in the manual that a Nokia account will be needed to get the most from the 800, and you'll be asked to set that up (or login to an existing account) during your first set up.

Here's the web based manual, the PDF, and the rest of the Nokia Lumia 800 support info at Nokia UK.