Great article by Chris Messina about Technorati's support of OpenID and what it means in the larger picture as well.
http://factoryjoe.com/blog/2006/10/20/writing-history-technorati-adopts-openid/

I know a lot of things have all come together to get OpenID to the point where a site like Technorati would be willing to adopt it, but thanks to brad, crucially, and others from Six Apart who really worked to make this happen!