As you all know by now that SP1 supports non-OS users. My initial thought was that you can create a non-OS user from within TeamSite (TeamSite will have it's own database) . But looks like that's not the case. Non-OS users that are referred here are the users that exist outside the system where TS is installed.
To brief a little more, first you need to create a user in an external source like LDAP or any third party application. Then add an entry in TeamSite user_database.xml file for authentication and only then you can add a non-OS user into TeamSite using the Administration tab or CLT.
This was one of the features I was looking forward, anyways bad luck

. This is just an FYI for those are searching for how to add non-OS users
Pradeep