I'll keep a running list of invitee responses in this thread:

alpaca
Declined

Zhuge_Liang
Primary Topic of Interest: Incentives
Secondary Topic of Interest: Team Mutiny
Preferred Methods of Hosting: either msn, mirc, forum thread
World Location/Time Zone: GMT
Tentative Preferred Dates for Seminar: TBA

Lusted
Primary Topic of Interest: Handling Public Relations
Secondary Topic of Interest: Beta testing
Preferred Methods of Hosting: Teleconference/VOIP (Skype or Ventrillo)
World Location/Time Zone: UK, GMT
Tentative Preferred Dates for Seminar: Anytime

Professor420
Primary Topic of Interest: Optimal Team Sizes and Responsibilities
Secondary Topic of Interest: Software Handling
Preferred Methods of Hosting: Teleconference/VOIP
World Location/Time Zone: USA EST (GMT -5)
Tentative Preferred Dates for Seminar: April 18th and/or 19th, local daytime