>> 1. What the hell does that do to the cars?
> It make them rust away.

It also corrodes the aluminium components, which nowadays make up for more 
and more of the car.  However, for both steel and aluminium components the 
anti-corrosion coatings have become better, so in general cars don't corrode 
as much now as they did in the past. Still, doesn't hurt to wash your car 
regularly (especially in one of those that washes the underneath with jets).

>> 2. Where does all this salt *go* to? Is this a problem?
> In the ground and the reivers. If you have clay rich ground, it's not a 
> problem as the salt make that clay harder, less prone to change into mud. 
> It can be a problem for the vegetation, killing it.

IIRC here in Germany they only use salt on the autobahns (the other roads 
just get grit) exactly for that reason.  There again, we all have winter 
tyres so it doesn't matter as much if there is a bit of snow on the roads. 
Ice on the other hand...

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