A hell of a lot of work seems to have gone into the login/logout side of sapphire/security/member.php
I really want to use the functionality but there's nothing on http://doc.silverstripe.com/doku.php?id=loginform... There is a link to API documentation on http://doc.silverstripe.com/doku.php?id=memberloginform but that doesn't help newbies! :p