Very very few.
I like to rely upon BBC, as it is legislatively mandated to be objective. Indeed, recently there was a huge scandal due the fact that it was accused of being anti-Government in the UK and there were several resignations, sackings (and even one loosely related suicide).
The BBC is objective (
http://news.bbc.co.uk/). That means it posts some pretty damning stuff about US policy sometimes and is therefore lambasted by many conservatives, but objective it is nontheless.
I also believe some of the "webosphere" sites are considered reliable. Once again, that's only until some Democrats/Republicans contest its findings.
Some of these include
www.infoplease.com
www.factcheck.org
After that, I'm not so sure. I think CNN is closest to a non-biased mainstream news agency the US has, but that's my opinion. Conservatives hate it.
See a pattern here?
Certainly MSNBC, CBS, Fox (lol!!!!!) are not objective in any reasonable sense of the word.
Great idea for a thread.
Mr Mephisto