We don't normally link to official manufacturer user guides going online, but I'll make an exception in this case, since both the Nokia N8 and Symbian^3 itself are going to contain items that are new to even hardened Symbian watchers. The N8 user guide is a 4MB, 122 page PDF file and, although still briefer than we'd like it to be (to mention every function), does contain instructions for using things like WebTV and USB-on-the-go.
Yes, hopefully most users (from these parts, anyway) will never need to read the user guide, but it's still nice to have it - and, in this case, a week or two in advance of the real thing - have a flick through over your morning coffee?