I noticed that the StackExchange OpenID provider isn't listed as an option on the Careers 2.0 website. It is an option on the family of SE sites (with the AOL option being replaced with a smaller logo), but the Careers site doesn't appear to share the same options. I thought I would point this out for consistency's sake.
All other sites:
EDIT: I found another question that indicates the same issue occurs on the Data Explorer site: Missing openid option at data.stackexchange.com.