Do you use mod_auth_mysql, the Apache module that allows authentication of users to happen through a MySQL database?
If so, the nice folk at Automattic (makers of fine blogging software like Wordpress) have released a patched version that works with phpass.
With this, you can now have single sign on (SSO), with authentication against a WordPress blog (or bbPress forum). Note that WordPress (in 2.5 and later), doesn’t use MD5 hashes to store passwords any longer; instead they are salted and hashed with the phpass library. The Automattic folk use this to provide SSO for Trac and Subversion.
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