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According to Wikipedia: http://en.wikipedia.org/wiki/Energy_density#Common_energy_densities
The energy density for gasoline 47.2 MJ/kg and Lithium air battery 9 MJ/kg.
If five times less is "comparable" I wouldn't mind the li-air car cost of $4000 which is comparable to a regular gas car.
I thought FON http://corp.fon.com/en was doing this worldwide already. You install custom firmware on your router, share your Wifi with the community and then you can use other people's Wifi. They even have a google map with available FON locations. In my town of 100K people they have around 20 FON spots, which is not enough for blanket coverage, but better than nothing.
One idea is to run a usb-extension cord (6-10 foot) from your desk/lapt-top and connect a reasonably good webcam to it. Then run YawCam (free) software with motion detection.
This situation strikes me as very similar to what happens in financial markets. The whole industry is not creating any value, since they primary occupation is buying paper and then selling it at a higher price.
Some may argues, that the traders add efficiency and liquidity to company price formation. Can we apply the same argument to patent trolls?