I'd certainly be up for that. Given how very quiet the chat area generally is, it might give us a way to increase participation. If there's one thing lacking in the site currently -- it's inherent in the SE model, I think -- it's interaction. Time zones are a bit of a hurdle for real-time chat, but better something than nothing.
It would likely be more interesting and more useful if several designers participated in any given chat, rather than one. Everyone I know has his or her own way of approaching a given design challenge, and once you start talking Photoshop techniques, where there are a minimum of 10 ways to do almost anything, the more folks who are involved, the better.