1. Facebook connect.
Remember that Facebook only knows what you tell it. You could always make an account with only required fields filled out, NEVER use it as intended (set all the security/privacy to the highest and don't every friend anyone, join any groups, or "like" anything), and just use that as your SSO solution.
Or if you simply refuse to use Facebook at all:
2. Lastpass. Can't say enough about these guys. It is FREE and just works.