I was browsing on Stumbleupon and I found this cool website where you can copy/paste your press release and it "grades" it based on language and tips from IMers.
Press Release Analysis for Free | Press Release Grader
I haven't used it since I don't use press releases but it seems like it'd be a great tester for someone who uses PR as a marketing tool.
It comes with an overview video as well.
Hope that interests someone!