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I think the biggest advantage I see is the cooktop is much safer. There is a coil where a traditional burner would be. When you turn the dial to send power to the coil, it creates a magnetic field, and induces that current onto the magnetic cooking vessel you are using, which creates the heat (hence 'induction' cooktop. There is no direct heat, so touching the 'burner' will not cause you or anyone who may contact it to be burned.
In addition, they tend heat your cooking vessel very quickly. Electrolux (I think that's the one that Kelly Ripa does the ads for) advertises their cooktop can boil a full pot of water (how big that pot is, I don't know) in less than 90 secs.
It is also true that Al cooking vessels are pretty useless on induction cooktops, and they have no magnetic properties (the absece of Fe in a vessel does not lend itself well to magnetic-type operations).
Hope that helps, your milage may vary.
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