Two weeks later, Blogger's OpenID comment tests are over. The feature has been released to all Blogger blogs. They've also fixed handling of URLs with "www" in them, added OpenID comments to post pages, instead of just on comment.g, and added a Blogger favicon to Google Account/Blogger Account comments.
Now all they need to add is the ability to use Blog*Spot URLs as OpenIDs themselves, and we'll be set. I can't wait to ditch the AOL delegation I put in my blog's header, which is broken anyway.