"Never trust a computer that you can't pickup"
I just chuck it into the next room. Or kick it across the carpet. Works fine. (Kidding)
I guess I've never really paid attention to how I carry it. Often though, it's in a leather bag over my shoulder. Otherwise, I just grab it. Dunno, whatever feels good!
The only thing I'm really OCDish on is my pockets. Cellphone, upside down (so you reach in and grab it and are holding it in the proper orientation, i.e. dock connector faces up) in my right front pocket, keys left front pocket, wallet back right pocket. If any of those items are missing, or in the wrong pocket.. it just ain't right!