The Independent - Centrist liberalism.
The Daily Mirror - The paper of the Labour Party mainstream (well, the little news that's written in it anyway).
The Sun - Populist in an even more stupid way than the Mail. Usually backs whichever party is leading in the polls at election time.
Television/Internet:
BBC - It's often fiercely debated as to whether it's impartial or not and if not where it does stand, but it's probably fair to say that it's (to echo Andrew Marr) culturally liberal.
Sky News - Often labeled as our answer to Fox News, but really it's more our centre-right answer to CNN.
Feel free to list the outlets (and their respective biases) of other countries. 
I think the Indipendent has moved to the left of the Guardian in the last decade or more, I'd call it centre-left and Social Democratic with Green politics thrown in there for good measure
The Sun and Mirror are each right and left on economics but with both their social issue stances very based on populism (eg libertarian stances on poen, sex, drugs and rock'n'roll , conservative ones on justice, law, immigration)
Also, with the BBC, a lot (maybe 40%) of it's output has overt leftwing-liberal biases, including some of its news reporting, QT audiences embarrassingly so (they are nothing like a fair representation of the UK electorate) and almost all comedy and drama, though there are also obvious conterbalances-Nick Robinson's role as cheif editor has evened out Political reportage somewhat recently- and people like Andrew Neill, Michael Portillo, UKIP QT/AQ guests, Melanie Phillips, Peter Hitchens, most of Top Gear, and arguably Ian Hislop (though he's hardly friendly to the Tories as an institution).
So i think it is now pretty neutral.
Honestly don't see Sky's bias.
