Launching a successful Facebook group is a definite art.
Get your favorite bloggers to write an article about your group.
Start a discussion using Facebook Notes and make your group the logical solution to a problem that people might face.
Identify those special members by signing them up to your optin list or joining your Fan page.
Focus on adding value and encourage your group members to share their own talents.
After this point it will hit critical mass and continue to grow on its own.