Strap yourselves in, pilgrims. Nokia's next great handset has resurfaced in London today, and this time we were even allowed to turn it on. There's pretty much no way you could be unaware of the N8 by now -- Nokia's done the viral video thing, the teaser demo thing, the feature walkthrough thing, we've covered it to near-exhaustion. But we've never seen it, you know, doing stuff. You can now consider that omission corrected, as we've finally powered up the 3