This BoingBoing article links to a Nature article about a 1mm sheet of plastic that can transmit power to nearby electrical devices. The plastic sheet has organic transistors embedded into the material that control the flow of electricity and copper coils which will actually conduct the power. The plastic sheet can deliver power to devices within a 2.5 cm range to devices with the proper receiving coil. The sheet is currently used to power LED's and (presumably) items with a similar load. According to the Nature article, the sheet is constructed in 4 layers. The layers of the electricity transmitting sheet are printed using screen printing techniques and electronic ink-jet inks.

RF battery chargers will be coming soon from Powercast. The chargers work by emitting an RF signal from an attachment to a powered source such as a lamp. There is a receiver that is placed with the battery which constantly charges the battery. The RF signal apparently does not have a very long range - the article does not make it clear if this is due to government regulations or a technological limitation. My mind is drawn to the works of Nikola Tesla who is said to have developed a similar technology 80 years ago (which may have been used to power an AC car).