Portal just came out of beta, and as I understand it Day of Defeat: Source didn't have one to begin with. Neither is listed in the Steam store as having a Linux version, nor do they appear among the games listed in the Linux section of the store. This despite the fact that GoldSrc games still in beta, such as Half-Life Opposing Force and Blue Shift, are already listed in the complete list albeit with their original release dates.
Portal just came out of beta, and as I understand it Day of Defeat: Source didn't have one to begin with. Neither is listed in the Steam store as having a Linux version, nor do they appear among the games listed in the Linux section of the store. This despite the fact that GoldSrc games still in beta, such as Half-Life Opposing Force and Blue Shift, are already listed in the complete list albeit with their original release dates.