Yahoo unofficially supports openID

[Syd]

http://www.vecosys.com/2007/01/28/yahoo ... ts-openid/

[Indra]

I've never heard of openID until reading this link.  My first thought about having a single sign on to multiple providers of web-based services is that it is a huge security issue.  Get someone's openID login, and you gain access to their account in all participating services

[Syd]

My place of employment uses such a thing that is similar to openID.  Yes it is a risk, though, imo, the benefits far outweigh the consequences.