I took them up on their free 30 day demo of it and found that all the 'pro' content was mostly information that can be found for free elsewhere on the 'web (with much searching).
It was nice to see the 'pro' content centralized on IMDB, but worth $13 a month? Not worth it in my eyes.
Others may disagree with me.
Yeah I don't think IMDB lists contact info.. but you can get it (for actors anyway) here:
http://www.contactanycelebrity.com/