http://www.amember.com/
aMember is a membership management script in PHP. It integrates with multiple payment gateways, handles secure access, integrates with WordPress, Joomla, vBulletin, etc. Looks useful. $180.
http://barry.wordpress.com/2008/05/19/mod_auth_mysql-and-phpass/
A patch for mod_auth_mysql to support the new phpass format used in WordPress 2.5+. It's an apache mod.