In a previous article, I've described a way to setup an OpenID provider using SimpleID. Its only major drawback was the lack of support for any strong authentication ... since today. I've patched and released a version with Yubikey One-Time Password support.

This version is based on the latest released version available on the official SimpleID website: 0.7.1 and also include patches to work correctly with PHP 5.3.1.
I will contact the author to see if he's interested in this feature and if he wants these patches to be included in the official SimpleID tree, but if for any reason they would not be accepted, i'll keep my git repository up-to-date with any future release.

More interesting than a long blahblah here is the git repository : http://github.com/adedommelin/simpleid-yubikey

Please take 2 minutes to read the small README as it explains how to associate your key to your OpenID Identity.