Since it's a difficult skill, like it or not the identity of the group espousing the belief does play a role in coloring the credibility. It is one of the multitude of variables by which human's judge potential correctness. My personal coefficient for BBC is higher than most of US cable news (and honestreporting.com as well). The coefficients are issue specific too, though there is a certain issue independent component that different issues inherit from the base.
It so happens that there are issues that I care about, for which there are no US main stream source that has significantly positive coefficient. It is for (not uncommon) situations like this that I need alternative sources like Al Jazeera. In addition to un-affiliated blogs
If you're looking for a solid US based news agency, I would suggest PBS news. They have a pretty high 'coefficient' in my book. They've been covering the various Arab riots quite extensively.
Main site: http://www.pbs.org/newshour
Nightly news: http://video.pbs.org/program/979359630/
And many people believe that the BBC is biased when it comes to covering Israel.
For example: http://honestreporting.com/bbc-responds-to-flotilla-inquiry-...