The Yahoo! OpenID (beta) which was announced earlier this month has just been launched. You can try it out right away. This is expected to move the OpenID movement ahead considerably. All 250 million members of Yahoo are now able to log in to any website, not just Yahoo, that supports OpenID 2.0. At this moment you can find very limited list at Yahoo which I hope will be expanded soon. openid.yahoo.com
I'm holding off on using the yahoo-version of this for now - because I'm just not sure I want to be using the same login code for my mail and other information (especially the other way around - obviously).
i am not so sure the security issue of openid. and i am not that interest in this service at the moment On the other hand, because i have two yahoo accounts. i find that it is time consuming to switch between two yahoo accounts only, log in log out log in log out.... and the page loading is not that fast compare to google