This is the one we are running and it's not slow or anything. You can still see everything on the forum but there is a discussion box on the top. It reloads every few second but there doesn't seem to be any lag time when you make a post in it.
If interested and need more info get a hold of Jon the administrator over there.
I was just thinking that maybe we should hold off on the chat. When my other forum put one on posts slowed to a crawl. All offtopic things went in the chat then people started asking questions on there. Eventually there were hardly any posts in the forum. Seems like we should build up the forums before introducing something that could bring down the amount of posts. I'm not sure how search engines work but I would think the more posts and traffic you have the higher in ranks we get.