Dec 17th 2007 7:48AM If you check the official stats at www.steampowered.com ou can see the following;
Servers Player Minutes
Counter-Strike 259,139 129,563 9.074 billion
Counter-Strike: Source 41,015 44,427 2.472 billion
Counter-Strike Condition Zero 23,281 18,673 991.217 million
Original CS is currently being play by 5x the amount of players that CS:S is and racks up 9+ billion minutes a month compared to 2.4 billion for CS:S.