This information was forwarded to me by Stefan Burak a PAM for San Fran. We still like Stefan even though he left us and went over to the sales side of the house. :-)
In addtion, there are a bunch of great articles on Microsoft's site about holding Web Meetings...
Some related articles to check out on the expert zone of the Microsoft Partner Events.com site (esp. Mac McIntosh’s ‘live or remote: chosing the best format)
Also, off our our marketing services for partners website there’s “Ten steps to hosting a seminar” (good tactical overview):
How-To deliver effective presentation: roadmap with checklists:
Tips: understanding the audience: