I think it's a big mistake to try and draw a line between corporate and residential IT. In my former career as an IT guy, I dealt with just as many residential customers as corporate customers. There's also a lot of overlap in challenges faced. I saw a question on ServerFault about how to change monitor refresh rate which was closed as being not sysadmin-related. Would the same thing have happened if it were cleverly posed from a corporate perspective? I suspect not.
Trying to separate corporate and residential IT is like trying to separate HTML and CSS; they're so closely related. I think SuperUser is fine for questions about how to do blah in Microsoft Word, but anything to do with adjusting system settings or system building is, in my opinion, most definitely sysadmin-related.
I had a question of my own closed by Jeff on Serverfault where I asked about TV tuner cards that supported HD via satellite instead of just HD over-the-air. Yes, it was for a computer in my house, but so what? I could easily have posed the question like this: "Our company has an HDTV in our boardroom connected to a satellite dish on the roof. The CEO isn't happy with the quality of the HD channels..."