What are your most useful synchronous online facilitation practices?

Beth's Blog: How Nonprofits Can Use Social Media

So, I've been reflecting about effective facilitation of virtual meetings in Second Life Right now the primary method of group interaction is via unmoderated chat interface. I learned one from Nancy White when I took her online facilitation workshop. How does SL compare to these other tools and where does it fit on the gradient? And, how does a virtual world tool help or hinder effective online collaboration or a synchronuous online communication?