According to the official announcement, Half-Life 2, Episode One and Episode Two are out of their beta versions (on Linux). This happens a few days after Portal has also reached a stable version, on Linux Systems.
The Linux users are dissapointed because the Episode Three was not involved in this update. Even though, it is still good news.
July may be a good month for the Linux gamers, it may bring many good Valve Linux news.
If you do not have the Steam client installed on your system, see the articles below to get installation instructions