Valve Software / Steam has announced:
Updates to Half-Life 2, Half-Life 2: Episode One and Half-Life 2: Episode Two have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Half-Life 2 Added support for Mac Added Steam Cloud support for save games Added new achievements Improved graphical effects
Half-Life 2: Episode One Added support for Mac Added Steam Cloud support for save games Added new achievements Improved graphical effects
Half-Life 2: Episode Two Added support for Mac Added Steam Cloud support for save games
Note: Save games for Half-Life 2 and Half-Life 2: Episode One will go through a transition. The current level you are on will be saved, but not the exact position in the level.