I just added the OpenID plugin to my wordpress blog and set up an account at myopenid.com.  It was very easy to setup and now I can login from my laptop using the client ssl certificate installed by myopenid.com.  That means I never have to enter a password.  This is very convenient.  If I lose my laptop I just have to remember to go to myopenid.com and revoke the certificate.

Also, anybody with an OpenID account can post comments without first creating a username and password.