There was some interesting discussion about bloggers breaking news and attribution here:
http://gigaom.com/2012/02/25/is-linking-just-polite-or-is-it... (and in related twitter discussions)
I'm not entirely familiar with 'old media' practices, but I always thought if two news outlets independently confirmed a news story they didn't acknowledge whoever broke the story first. Or if another news outlet breaks a story, they independently confirm and don't give attribution, since technically, they confirmed the story, so it's 'their news.' I've only heard a news source attribute another source when news is breaking in real time (i.e. X is reporting 7 are dead at the scene). Breaking a story != confirming or actually being a journalist's source.
In some cases, attribution is very important - like in the original post. However, I think a lot of 'new media' beef with old media practices is just a shift in ideology . Bloggers are closer to the action and transparency is more important. Old media is much more rigorous but is less transparent. I personally think the best approach is something in between the two.