This is one of those minor details that somehow I easily notice: this morning, KCBS 740 AM in San Francisco switched its tagline from “KCBS All News 74″ to “All News 740 KCBS”. Presumably, this is due to all them newfangled digital radio displays that display the entire frequency, instead of leaving off the last digit. How easy is it to switch taglines after more than 10 years? Ed Cavagnaro, news director at KCBS, said of the transition, “Yes, it’s difficult, but we have it written down near the microphones for an easy read.”