Wheel Clamps and Boots
Putting a boot on your car is really an impractical option for the average person. Unless you drive a high target vehicle in a high theft area, using a boot is probably more trouble than its worth. Wheel boots can not only help deter people from stealing your automobile, but also prevent people from stealing your wheels if the boot covers the lug nuts.
Alpha LockTM - Used by the Police, US Customs, the Armed Forces and Government Agencies, the AlphaLock is claimed to be the strongest tire lock anti theft device available to the public.
Universal Boot - Manufactures and sells a couple different wheel immobilizers.
DIY - Buy 3 feet of a rubber coated, heavy duty chain and a heavy duty pad lock.