I noticed this entry on the Spring '10 Preview website: http://developer.force.com/releases/release/Spring10/Authenticated+Website+User

Sounds intriguing - I assume this means we can allow public, non-portal site users to create user accounts and authenticate.

I kicked around a Spring 10 pre-release org and see the profile type there, but I cant do much with it.

Anyone have details around this new user type? Also, what's the pricing structure going to be? The portal pricing structure has been the main reason why we haven't been able to move ahead with creating authenticated Force.com sites. Hope this changes things...