Yeah, but the only reason I respond is to fend off people seeing a thread like this and then saying, "I have this too! Am I infected with something?"
Now technically, he shouldn't normally be seeing wheel for his account. I checked my current installs of Snow Leopard and Mountain Lion, and ls -l in both assign all of my user account ownership as staff. But as the text in Apple's own documentation show ...
Typically, all files and folders are assigned to either "staff," "admin," or "wheel".
... it doesn't always come out this way. What I referred to above was I kept erasing a partition over and over to test various versions of OS X with the Adobe CS5.5 and CS6 Master Collections to see where a problem was being introduced, and how to fix it. With this thread in mind, I was also watching the ownership assignments. Most of the time, my admin and standard accounts came up as staff. But once in a while, they'd be wheel. But it makes no difference which one you are assigned to. It's like being King or Emperor. Same difference.