Should I take a multivitamin? Which kinds should I look for, and which should I avoid?

I've heard a lot of mixed things about taking vitamins in general, some saying that they are basically a racket and don't make a noticeable difference, while others swear by them. I know not all are created equal, so are the supermarket brands worth buying? I'd like to get my money's worth if I'm going to purchase them.

Do you think multivitamins are essential, or over-marketed?

Should I take a multivitamin? Which kinds should I look for, and which should I avoid?
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