That would probably be a wheel bearing. The throw out bearing is somthing that you usually only change when you replace the clutch. But if you dont drivea clutch too well it could wear out faster. What I mean is if you sit at a red light with the clutch in or hold the clutch in while you brake the car it can wear the bearing faster just because it is being used more than it should be.

 

I know there should be some play, but there is way to much and the inner race on the bearing doesn't spin in a circular motion, it's more of an oval.