Barrons: Also on a tear are shares of several little-known outfits that supply components for the iPod and other portable digital audio devices, known generically as MP3 players. Among suppliers are Texas Instruments and Hitachi, though such work is a tiny part of those giants’ revenues. But the iPod is big business for smaller companies such as Synaptics, SigmaTel, PortalPlayer and Audible, whose stocks have shot up in the iPod frenzy.
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