EA to distribute Half-Life 2, Counter-Strike: Source
Multiyear agreement sees publisher take over retail duties on storied shooter franchise, EA publishing Xbox HL2 in October.
Just over three months ago, one of the most contentious relationships in game history came to an end. On April 28, after months of overt legal disputes and covert bickering, VU Games and Valve Software announced they were ending a half-decade-long publishing deal. The arrangement saw the former publish the latter's groundbreaking PC first-person shooters Half-Life, Counter-Strike, and Half-Life 2.
Source : http://www.gamespot.com/news/2005/07/18/news_6129331.html?tag=lastword_pc_headline
So the sucky steam will be exclusive for PC users only...