Here are other posts on Microsoft and OpenID announcement:

Kim Cameron (Microsoft) post

Michael Grave (VeriSign) post

“this is a significant step toward the convergence needed in the identity space”

David Recordon (VeriSign) post

“Convergence isn’t new for OpenID, rather continues to show how it is a great technology to innovate around. This isn’t about one technology swallowing another, it is about true cooperation, collaboration, and ultimately convergence.”

Scott Kveton (JanRain) post (I think this excert from Scott about how this affects the OpenID community is spot on)

There are a couple of points I’d like to make outside of the above announcement to hopefully address any concerns that the OpenID community might have:

• JanRain will never require users of our libraries or services to use Windows CardSpace ™. We offer support for this technology as another option for users much like using our Safe SignIn and Personal Icon technologies on MyOpenID.com. We’ll also continue to support the OpenID efforts going on with Mozilla and Firefox.
• Windows CardSpace ™ is shipping with Vista today and is a well thought-out technology that helps address many of the privacy and security concerns that people have had with OpenID. OpenID helps users describe their identity across many sites in a public fashion. The two together are very complimentary products and each has its strength.
• Microsoft did not cave in to the OpenID community and the OpenID community is giving nothing up to Microsoft. This is a collaboration on bringing the best technology to the marketplace as quickly as possible to help secure users and solve the single sign-on solution once and for all.
• Please reserve judgment on what this all means until you see it all work together. The technology is really quite simple and the ramifications for end-users is huge. It also goes a very long way to completely addressing the phishing concerns we’ve heard so much about.

Johannes Ernst (Netmesh) post

“… come together so we can really get to an interoperable, multi-vendor, user-centric identity layer for the open internet”