Wireless transfer of electricity

The Energy Blog has an interesting post about transferring power without cables. This technology (being developed by MIT researchers) works sort of like magnetic induction, in which two physically-separated coils transfer power using magnetic fields. But the technique described in the Energy Blog post uses resonant coupling, which works over greater distances with little or no interaction with the surroundings (furniture, people, etc.). So someday this might allow us to run our laptops and cell phones without power cables or batteries.