Sirius Names Mel Karmazin as Its CEO  LOS ANGELES (Reuters) - In the latest coup for the  fledgling satellite radio industry, Sirius Satellite Radio Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SIRI.O target=/stocks/quickinfo/fullquote"&gt;SIRI.O&lt;/A&gt; on Thursday named former Viacom Inc. President Mel  Karmazin as its chief executive officer.