It would seem as if "serverfault.com" should read as "serverfault" like all other sister site links in the footer. Likewise the same change should be applied to both "stackoverflow.com" and "superuser.com".
Just my personal opinion but I don't agree with this at all.
I would imagine the reason why Stack Overflow, Server Fault & Super User all use
The rest of the sister sites are all Stack Exchange 2.0 sites and all "live" on the