There are dozens of OpenID providers. Here's what to enter for some.
Parts in bold need to be replaced with your username on that service.
AOLopenid.aol.com/screenname (AIM usernames work too)
Bloggerblogname.blogspot.com
Flickrflickr.com/photos/username
Googlegoogle.com
LiveJournalusername.livejournal.com
LiveDoorprofile.livedoor.com/username (Japan)
Orangeopenid.orange.fr (France)
SmugMugusername.smugmug.com
Technoratitechnorati.com/people/technorati/username
Voxmember.vox.com
Yahooopenid.yahoo.com
WordPress.comusername.wordpress.com (first login to wordpress.com)