Have you seen these two SlideShare prezos?
Writing quotations for press releases
The first has been popular. It's guidance on crossing the chasm between a conventional PR quote and one that journalists will find useful and credible. My advice: Try to strike a balance.
Learning AP style with visual reinforcements
The second isn't eye-opening; it's meant for reinforcement. When you're learning AP style, it helps to expose yourself to visual representations of correct style. Better still, if you do a lot of editing or writing of press releases, that experience is a valuable way to acclimate yourself. This prezo puts right and wrong on the same slide, with visuals to reinforce which is good/bad.