I just made a page for visitors to post questions—you can see a link to it in the navigation bar at the top of each page. I get a fair number of questions, sometimes attached to a random post because the visitor didn’t really know where else to post the question. So now there’s a place.
If you put a relevant question into the comments there, I will respond. Of course, my response may be simply to tell you that I don’t know. But feel free to give it a try. It’s not exactly an internet forum, but it will serve for now.
21 June 2008: Of course, the first question (an excellent one) stumped me. More, please. I’ll have a good answer to someone’s question eventually.