As you can see, we now have a discussion forum for Cookbooker. We are using Vanilla Forum software for this; it's simple, clean and has some very useful functions - for example, you can use your regular Cookbooker account here, and will not have to sign up again.
You may have to click the 'sign in' button on the forum page to activate your account, but you should not have to log in again or create a new account just to participate.
Please also let me know of any problems with using the forums. We're using Vanilla 2, which was just launched in late July, so they're still stamping out the occasional bug.
Also, you can suggest categories for discussion. I'm going to start with only a few, to get us going. As we grow we can see what areas people want to discuss and add them accordingly.