Oh, it's going to way different from now if you have kids, believe me :-)

So, accounting for gasoline engine's inefficiency and the fact that li-air is 43.2 MJ/kg is it now 4-5 times more efficient than gas?

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?

A very simplistic, but nevertheless, hard data set does not support their claim:
satanism: 2,680,000 results
christianity: 59,800,000 results