I have accesed the superuser.com site and logged in with my Google based OpenID. Then I wanted to associate the superuser with the stackoverflow user. I went to Stackoverflow and selected 'Associate with Superuser.com' this went well, however my stackoverflow user does not know the serverfault or meta.stackoverflow users anymore, and when I try to associate I get a 'Cannot associate, because it is allready associated'.
Here are my user id's: Stackoverflow: 47860 (knows superuser) Meta: 129989 (knows serverfault) Serverfault: 13724 (knows meta) SuperUser: 4655 (knows stackoverflow).
So I have two pairs of associated users instead of one carré.
After comment of Jeff (2009-08-07)
Some more info: When I am in superuser and I associate with either meta or serverfault I loose my association with serverfault and visa versa.