The BBC have an odd 'must be fair at all costs' policy which makes their coverage of events like this quite hard to follow - it's like an inverse Fox, where they'll have dissenting opinions and pundits given equal airtime no matter how marginal their view. In this regard they've been kinder than I thought they would be to the McCain campaign and over the last couple of days have been going along with the general media feeding frenzy of 'the race is tightening! listen to us! we are important!'. At the moment they've just finished an explanation of the electoral map and when the polls close and have gone into a retrospective of the Bush years with a big negative Bush / world view of America spin.
Sky are like a mini Fox (Murdoch owned), but they aren't allowed to be as blatant with their bias due to UK broadcasting standards. They're playing the 'race is closing, polls are unreliable, it's almost a dead heat, we'll have to wait and see' angle.