Yahoo + Flickr + OpenID?
This can be found on any http://flickr.com/photos/YOUR_ID/ page:
<link rel="openid2.provider" href="https://open.login.yahooapis.com/openid/op/auth" />
You cannot use that login as an OpenID yet, but it should live soon, apparently.
Another win for OpenID.
Update: more comments from Simon Wilson.
