What are the costs and frequency of servicing for electric, hybrid and plug-in hybrid cars?

Is there any data on the costs and frequency of servicing for electric, hybrid and plug-in hybrid cars? Also, is the introduction of this new technology likely to result in some independent garages being...

Can I buy a hybrid even if I don't use it during the winter?

I am looking at a Toyota Yaris, the car will not be used in the winter months and garaged. Will this affect the life of the lithium batteries if not used for four months each year?

Do plug-in hybrids self-charge while driving?

Does a plug-in hybrid have any self-charging capability?

Range Rover or Porsche Cayenne?

I'm looking to buy a one year old Range Rover D300 HSE, or a Porsche Cayenne E Hybrid. Both will be around 5k miles, and I intend to keep them until they are five years old. I'm worried about bad press...