If you've flown in the past decade you've witnessed the call to cease use of electronics while the plane is taxiing, talking off, and landing. A sore spot with many travelers, there are signs the Federal Aviation Administration may introduce a more lenient set of rues this year.
According the NYT's Bit's blog, "…the FAA is taking a fresh look at the use of personal electronic devices, other than cellphones, on aircraft.” This would seem to allow tablets and ereaders. This could possibly include gaming devices and music players.
The ban was set to prevent any interference from electronics from disputing critical flight systems. The FAA has never offered any evidence that this could occur.
Note that the current rules actually allow airlines to request use of electronic devices, but the requirements are so burdensome that carriers can't realistically consider that route.