I tried using the "add openid" feature and then clicking on the "Sign In Using Weave" button that the add-on has, I get the chomping lizard page:
...but then I get this error:
Unable to log in with your OpenID provider:
was expected to be base64 encoded but is not.
I suspect it's a Weave issue since it's beta, but just wondering if there's a workaround for it.