My favorite part of OpenID has always been that you can delegate your identity using your own site. myOpenID got increasingly spotty for me, so I switched to Google. If I decide to stop trusting Google, delegating elsewhere is almost no effort.

Here are the magic tags for Google:

  <link rel="openid2.provider" href="https://www.google.com/accounts/o8/ud?source=profiles">      
  <link rel="openid2.local_id" href="http://www.google.com/profiles/[your profile id]">

Looks like Clavid also supports delegation:

http://www.clavid.ch/index.php?option=com_content&task=view&...