[EyeballKid]

Cool - will definitely install!

I've been working on some projects along similar lines. First one is http://churnalism.com/extension

Browser extensions which check news articles against a central database of press releases, and can highlight shared text. Disclaimers: It's pretty UK-centric and I think the infrastructure needs a lot more work. I'm somewhat hesitant to expose it to HN at all... but hey :-)

There is also http://unsourced.org, which lets you attach warning labels onto news articles. There's a browser extension for that too, but the whole project is pretty quiescent right now while I work on other things. But I've got a lot of plans for both these projects...

Not one of mine, but for a more US-oriented tool, also check out: http://churnalism.sunlightfoundation.com/ (again a website + browser extension combo)