I just launched a site that aims to solve a two-sided market problem with a simple newsletter-style solution (a similar approach is found in HARO). In this case, it's product placement.
The site: http://productplaceme.com
I've gotten some modest coverage so far but I'd like to build up the list more before I send the first one out (Tuesday).
I've seen some clever solutions to the chicken-and-egg problem here on HN. What did you do? Or what would you do for PPM?
His advice was that "you always focus on supply first... then you shift to demand." Here that would mean to try to grab producers before promoters.
The idea is that producers are more willing to list their movies on your site, no harm done, but promoters won't be interested unless you have some movies for them to choose from.