Since I am going to start migrating all my web logins to a single sign on approach (using Chris Zarate SuperGenPass), I think the best way to start is by saving the bookmarklet I will have to use over and over. There is a Greasemonkey version available, which has much more features than this bookmarklet version. I will use the latest because it works with all browsers.
The bookmarklet is: Single Sign on.. Drag and drop it on your bookmarks, lets see if it works (Firefox only). Firefox users can also use a Greasemonkey script for this. You can read more about that one at the developer’s website.