At home, the idea of locking down your Mac—especially a large, heavy iMac—doesn’t really make sense, but in education and business environments, this may be an important consideration. Not surprisingly, Maclocks has a solution for Apple’s desktop machines with its iMac Cable Lock ($40+). A six-foot long steel cable can be wrapped around your desk or table, and then the lock gets snapped into the slot beneath the power port;…