What are your most useful synchronous online facilitation practices?

Beth's Blog: How Nonprofits Can Use Social Media

It worked for me because of the clock technique we often use to facilitate conference calls. That's why Nancy White's post on most useful synchronous online facilitation practices really caught my eye. So, I read it with this question in mind: What techniques can be applied or adapted to Second Life facilitation or virtual world interface facilitation? Nancy takes us through a gradient of modalities and technologies for synchronous meetings.