However Kurt Lang and Mark Jambert are stating that having the group wheel is normal for a fresh install.
This is from my first post in this thread- I WOULD EXPECT THAT THE GROUP WOULD BE STAFF.
I believe that it is possbile to have the updates, the Mac receives changed or directed to specific Mac's allowing changes like groups to occur.
No, updates just dump their payload with the permissions that are set in the payload. The 10.6 DVD does some kind of permission repair, this is possibly where the group WHEEL is being set. Again from my first post in this trread- THE GROUP WHEEL SUGGESTS THAT YOU REPAIRED YOUR HOME FOLDER PERMISSIONS.
To find the groups you have in your directory simple open up "terminal" type ls -l
And just as easy to chown and chmod! READ my second post. More than likely, YOU, changed the file modes on the directories in your HOME folder. In any case, it doesn't MATTER whether the group associated with those directories is STAFF or WHEEL. THIS IS NOT A SECURITY CONCERN.