The good news: I have arrived in sunny Southern California safe and sound.
The bad news: The same cannot be said for my PDA, which I seem to have lost, either on the Nashville-to-Memphis flight or in the Memphis airport. The Memphis airport lost-and-found and Northwest Airlines lost-and-found have not received it. The flight continued on to Kansas City; I have tried calling Northwest there but got a recorded message.
I feel like a complete idiot.