The satellite radio revolution, which began in the late 90’s, has just taken a new, more mobile turn. The nation’s two competing networks, XM and Sirius, now offer players that fit in your pocket. XM has four products—the Samsung Helix, Pioneer Inno , Delphi SKYFi3, and Samsung NeXus50—all of which are highly portable and can record and store MP3’s (www.xmradio.com; players from $149.99). Sirius has two new devices: the S50 and the innovative Stiletto 100, which has a wireless Internet chip that lets you tune in whenever you’re in a hot spot (www.sirius.com; players from $299.99).
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