TORONTO – Two years after launch, satellite radio company XM Canada now has 400,000 subscribers its parent company, Canadian Satellite Radio, announced today, after having added 50,000 in its last fiscal quarter, ended February 29, 2008."An increasing proportion of our subscriber base is coming from our rapidly growing automotive channel, which is a key segment for long-term success in our industry," said Michael Moskowitz, president and CEO, in a press release. "In addition to strong growth in automotive, we continued to gain momentum this quarter in retail sales due to our NHL exclusivity, strategic partnerships and strong Canadian consumer appetite...