We are looking at implementing OpenID in the Folksemantic applications at COSL. I have been trying to figure out how to present this new technology to our users. Most people have been adding OpenID alongside their standard navigation. DHH’s plugin uses http:// to indicate OpenID using your current login form. The password field disappears once the page notices that you are using http://
I think I like the magnolia is doing it. They make it clear that you are using OpenID and makes a quick case for signing up for an OpenID.