I have a website and sell prints but I don't consider myself a professional so I wouldn't want such a topic limited to professionals. Many of the photographers on the other site I visit are what I call production photographers, they do portraits, weddings, senior pictures, etc. I learn a lot from them but so far I haven't done anything I would call production photography. I prefer what I would call "fine art" photography which is a pretty fancy name for what I do but I don't know what else to call it. The distinction in my mind being that production photography is done for a client and fine art photography is done first to please the photographer. If it has market value then all the better.
As some of us try to find ways to market what we love to do I think we could help and encourage each other in the business side of photography.