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The reason they don't want you using personal electronics during takeoff and landing is that most personal electronics, even though they're shielded and not supposed to emit much, emit certain amounts of RFI (Radio Frequency Interference). While one or two devices might not interfere, a lot of them could interfere with aircraft pilot-ground communications, which is critical during takeoff and landing, when the aircraft is most vulnerable. If there is an emergency, the pilot needs to have clear communication with the Air Traffic Controller for emergency instructions and other necessary coms.
Cell Phones and Notebooks are the biggest RFI and EMI (electromagnetic interference) offenders - even though they're shielded, they still emit quite a bit of interference, and cell phones by their nature could theoretically directly overlap an emergency com frequency that the pilot is using. If you've ever noticed the bulge cylinder on the end of some computer and AC adapter cables, that's a device specifically designed for RFI reduction. But not all cables have those.
On another note, any fuel leak vapors during takeoff and landing could also be set off by the use of personal electronic devices if the plane were forced to abort the takeoff and a tank ruptured, though RFI is the primary concern. Same if the plane had a hard landing that resulted in a wing tank rupture and subsequent fuel leak. It's the same reason you're asked to turn your cell phones off while fueling your car.
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What is the difference between a pilot and an astronaut?
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