How Do You Get The Best SEO Results For Press Releases?

In Hump Day Hangouts episode 319, one participant asked how to get the best SEO results for press releases.
The exact question was:
Second question. I already have subscribed to a service for press releases. I have to untold those press releases before I can switch over to press advantage. How do I get the best SEO results, maybe backlinking?, With my current press releases?
