I was taught the latter (and mostly use it) but I don't subscribe to the notion that one is correct and the other wrong. I will include a comma before the "and" where it aids clarity; especially when one of the enumerated items already has an "and" in it (eg, "kith and kin").
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timeasmymeasure
no subject
Date: 2010-01-15 11:22 pm (UTC)