Six and a half years ago, [XM CEO Hugh Panero] believed in subscription radio service when few others did. Secure in that belief, Panero turned a staff of fewer than a dozen working out of a windowless basement office in downtown Washington into the leading satellite radio service, with more than 500 employees and 2.5 million subscribers. Its only direct competitor, Sirius Satellite Radio Inc. of New York, has 800,000 subscribers. ¶ Satellite radio has now come into its own, and competition is sizzling. ... Link: washingtonpost.com.