Three or four years ago (I can't remember now) we got rid of the discussion forums in our site redesign. There are just so many places to talk about books on the internet that we weren't sure there was a need for another one. While I still pretty much agree with that, there has been some interest from our survey responses for a place for FictionDB subscribers to congregate.
Last year, I looked into a site called ning that hosts social networks (what they seem to be calling forums these days). It's a free site so I set up a FictionDB page. I set it up with a Book Club theme since I'm much more interested in finding a great book to read than I am in reading the latest snarky comments on some of the other book blogs.
You can visit the new area at http://fictiondb.ning.com/ We haven't completely customized everything yet, but let us know if you like the area or not. And yes, you do have to sign up with them if you want to post :(