Fark linked up this interview of a journalist who went "under cover" as a used car salesman for three months. In it, he describes the things he found both good and awful about the business. Bottom line: not all car salesman are sleazes, but their business model makes them seem so.
I've only purchased one new car in my life so far, and we got lucky because my sister-in-law was (is?) a member of some club that guaranteed a car at exactly $200 over the dealer's cost. No muss, no fuss. The salesman was still greasy as an oiled gangster, but at least we didn't have to talk price with him.