Thanks mctablet and mikeob!

Mikeob, there is actually a built-in help system in the N800 with fairly detailed instructions, but it's a bit hidden. Within any particular application, click on the menu in the top left corner (on the desktop this is labelled "Home"), then select Tools, then select Help.

You can also read the entire built-in manual by going to the application menu (the two white squares), then Utilities, then PDF Reader, then the PDF Reader menu, then Document, then Open. Select the N800's Documents folder, and you'll see PDF versions of all the manuals in different languages. The english language manuals are right at the bottom.