Couldn’t have said it any better myself:
As of today Bloglines users can use their Bloglines login info to sign in to other sites that support OpenID login. This is good news, but more than a bit underwhelming at the same time. Big companies can announce all day long that they will now let you log in to other sites with their ID – it’s time for them to support OpenID login on their own site using credentials from other vendors.
Now, ask yourself why this seems so often the case.