I've just updated this site with the very latest code and have enabled authentication with Open ID and also with Windows Live ID. It is now possible to register or sign in to this site using either of these services.
Tip: If you are already a registered user of the site and you want to associate your Open ID with your existing site account you can do so on the My Profile page after you login with your current credentials.
For those interested, a good place to get a free Open ID account is at MyOpenID.com.
I really think single sign on is a huge thing the web has needed for a long time. I hope it catches on so I can use the same password at most sites. Now mojoPortal makes it easy to setup sites that support these single sign on services.
The code has already landed in svn in my sandbox and I will be merging it to trunk in the next few hours. Any testing would be appreciated. I would like to make a new release with these features very soon.