WASHINGTON -- XM Satellite Radio recently announced it added more than 640,000 new net subscribers during the second quarter of 2005 for a total of more than 4.4 million. This subscriber gain represents a 53% increase in new net subscribers compared to the second quarter of 2004, when XM recorded 418,000 new net subscribers. Additionally, the 640,000 net subscriber gain represents an 18% increase over the first quarter of 2005 when XM recorded 540,000 new net subscribers. "This was the best second quarter in the history of XM. The momentum behind XM's subscriber growth is undeniable. In just one year,...