There is this article on Identity 2.0 adoption. From the article:
Analyst group Kuppinger Cole and Partner analysed the 10 predominant topics and trends in identity management in 2008.
Identity 2.0 continues to receive the support and influence of industry giants, including Yahoo, Google, Microsoft and IBM.
I would point out that of this group only Yahoo actually supports OpenID on a web site, and then only as a provider. So far I am unaware of any major web destination that is supporting OpenID as relying party. The major players are all vying to control the user identity by making their web site the starting page for the OpenID sessions.
That’s not what I would consider Identity 2.0 adoption.