It's not a petty concern. Since Friday's incident en route to Detroit, airlines are ramping up security procedures at the behest of the government, and "approved portable electronic devices" have long been a whipping boy for this sort of thing.
Unfortunately, it sounds like they'll be verboten for international flights inbound to the U.S. While the Transportation Security Administration has issued no formal rules (and, in fact, is being deliberately vague about them) Gizmodo and several other sources are reporting the ban as fact.
Another key detail: for international flights inbound to the U.S., passengers will have to remain in their seats for the last hour of a flight, without access to their carry-on baggage (above or underneath a seat) and without any personal items on their laps. So, better pee up before that final hour, and make sure you're at a good stopping point in Assassin's Creed: Bloodlines.
It's also unclear how this affects travel within the U.S., but you can bet it will, beginning with long lines as screeners tighten their focus. Other measures either reported or expected include the aforementioned no cabin travel for the last hour of a flight; keeping the cabin lights on for the entire trip; disabling the display of a flight's progress in the seatback monitors offered on some planes; and generally making sure you resent the experience from check-in to baggage claim.
As there are a ton of variables in play here, for U.S. flights and for those in other countries, and as plenty of folks are flying either today or tomorrow - or this time next week - returning from holiday travels, we're opening up a comment thread here to report what you've seen. Especially as it relates to the use of electronic devices. Flying is such an unpleasant process these days, laptops, handhelds and DVD players have become almost indispensable for their diversionary qualities. Plus, some are still under the illusion they can get work done midair.