I take mine off the road too in winter.
I Add 10psi or so to the tyres to stop them warping. As has been said before, in gear handbrake off.
A battery conditioner is a must, and start the car every 3 or 4 weeks or so. Let it warm right up though, not a quick 2 mins then off again. A good indoor cover keeps the dust off.
Oh and dont forget to go and look at it often, so it still feels loved