I learned a really cool trick for helping cars stuck in the snow.
What you do is pull out the floor mats, stick them under the drive wheels. Once up on the floor mat, the car has about two feet of clear driving ... which is generally enough to get the car out of most stuck situations.
I've used the technique twice this year. In both cases, the cars where able to get out without making any noticeable wear on the floor mats.
In the past, I would put a loose set of tire chains in the snow below the tires. The chains would often go flying when the driver hit the gas. There is also a possibility of chains getting wrapped around the axle. The heavy duty floor mats on today's cars seem to stay flat.