You can click on the Google or Yahoo buttons to sign-in with these identity providers,
or you just type your identity uri and click on the little login button.
Related to http://www.logilab.org/ticket/77664, thus will require updating the dependency on yams >= 0.34.0
better implementation in another ticket
Ticket #1976640 - latest update on 2011/11/09, created on 2011/09/30