Places to Discuss Game Publishing and Design

There are three big ones.
  1. BGDF is the best place to discuss card and board game design. It is read by a number of people in that industry, but has fewer active professionals from the RPG and hobby game industry.

  2. RPG.NET has many forums of interest. Questions about industry stuff go to the Business and Publishing Forum, then there's the Art of Game Design, a section for hiring Freelancers, a place for Ads and Open Promotions, a Playtest Registry, etc. Poke around.

  3. The Forge has forums on game design, publishing, and on conventions.