google is slowly weeding out press release sites from it's list of partners after the recent fiasco concerning a kiddo who claimed in a press release that he got a job in google and would be hanging in there on their campus having fun with Larry and all that ... :lol: which was just a PR stunt and not a fact.
Besides that, we all know what 99% of press releases are: shameless-self-plugs It is in fact in the interests of Google to weed out "news stories" (OMG) from PR news agencies (read: self-plug distributing agencies) from it's news index, if they want to have any chance of competing with Yahoo News.