Registrationless posting...

Is there a setting to allow registrationless posting to the board? Or at least the kind of registration that lets visitors write and post their message ( it would go to moderation )... then they would receive an email with the rest of the steps they need to get their message live ( finish the registration ) . I guess you could call this Post Post Registration.

I like GetSatisfaction for that feature and think it really breaks down the barrier to posting for many who just don't want to go through the registration process..... but if they've already spent the time writing their message they will be much more likely to register so they don't feel like they wasted their time writing the post!

Thanks