Digging discoverable OpenID providers

Here's a list of big-time OpenID providers that are discoverable. This means you don't need an exact URL, which is cool...

• Google: https://www.google.com/accounts/o8/id
• Yahoo: http://yahoo.com
• MySpace: http://myspace.com
• myOpenID: hhttp://myopenid.com

Additionally, if you have Google Apps, you can craft an OpenID URL like this: https://www.google.com/accounts/o8/site-xrds?hd=example.com --- Hmm, but it doesn't seem to work... will update if I figure it out.