If there is a downside to the pace of innovation at Apple Inc., the Fox comedy show "MADtv" captured it recently in a spoof of an iPod advertising campaign featuring the musician Feist. In the segment, a look-alike for the Canadian singer croons about her unhappiness after a $400 iPod purchase at an Apple store. (See video clip.)

"And just after my purchase was done," she sings, "those Apple b- introduced a new one."

Those...