Credit:
Now, when you browse with Flock and open a web site that has OpenID support, Flock will collect and manage OpenID credentials, and automatically alert you if you can use a stored OpenID to log into it. You can choose which OpenID you can use to log into a particular site and later view the login history for each OpenID-to-site relationship you've created.
Or, if you'd like an even shorter version: Flock now has a password manager for OpenID.