A year after Apple's iPad launch, finds that tablet use has cut into every kind of media consumption and every other electronic device.

We're already seeing the result in sales forecasts. , with just 1 percent growth in the first quarter of 2011, our Melanie Pinola reported last week. . PC sales are down. predicts netbook shipments will fall 20 percent year over year. (Of course, the state of the economy also might have a little something to do with this.)

According to the study, 77 percent reported spending less time on their desktop or laptop since they got a tablet, 28 percent of tablet users say it's their primary computer and 68 percent say they spend an hour or more with their tablet every day.

If , we could see Apple iPads, Motorola Xooms, and RIM BlackBerry PlayBooks taking a substantial chunk out of the market for everything from TVs to game consoles, desktops, laptops, music players and .

People now spend more time using their tablet than: