Sxipper

Sxipper is a free plug-in for FireFox that lets you log into any website with a single click. Sxipper saves you time by keeping track of all of your user IDs, passwords, and the personal data you share every day over the web. Sxipper logs you in securely and helps to prevent you from being victimized by phishing sites and phony logins.

http://www.sxipper.com/

registered users receive a free OpenID to use as a Sxipper identity