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The idea of America's major two satellite-radio providers merging has been tossed around almost from the moment Sirius Satellite Radio (SIRI) launched its service against XM Satellite Radio (XMSR) back in 2002. XM had a year's head start, but as Sirius' share of the market surged, many analysts predicted a duopoly, with both companies eventually splitting the market in half. Yet, Sirius' surprising strength suggests it might be time for both companies to consider an alliance again. Continued head-butting could slow down both companies' quests to reach profitability. And they'll need financial stamina in the coming months, as they face a mounting threat from a slew of emerging audio technologies. Source: Businessweek