When people are on the go, they don’t want to carry more than two personal electronic devices: one in the pocket and one in the bag. When a third device crops up, it’s because it addresses a shortcoming in one or both primary devices.

I’ve been saying this for more than a decade, as InformationWeek‘s Patrick Houston noted in his recent ode to the not-dead-yet PC. I believed in the two-device maxim when PDAs thrust their way onto the scene. I believed it when portable navigation devices began selling. And I still believed it as Apple prepared to bring the first media tablet to market.

These days, though, amidst the persistent flood of tablet shipments and pessimistic PC forecasts, I’ve had to defend my little two-device maxim like never before. Are we temporarily out of balance? Or is this the start of a new normal?

Read the entire column on InformationWeek.com