Another trick is to keep your gas tank at 1/2 full or more. Keeps more weight on the rears.
I echo the comments about getting good snow tires. They will make all the difference in the world for traction. All 3 of my cars are RWD, and the winter car has a set of 4 snows. Really helps a lot.
Although it is true more weight in the rear will make it hard to control a slide, you'll be much less likely to slide with the weight already in place. Friction is directly proportional to weight applied. Also, sand bags/tubes are nice, since you can use the sand to get out of a low traction area if needed. Roofing shingles are good for this too (put them under the drive tires).
--jp
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