I’ve really been enjoying the Orange Box so far.  Unfortunately, I’ve encountered an apparent bug in Half Life 2: Episode 2.  During “Chapter 2: Vortal Coil” the game will consistently crash at the same point.  The crash occurs after you escape from the guardian ant-lion by dropping into a corridor.  At the end of the corridor there is a medic sitting against the wall.  When you walk closer to the medic, the display will freeze and you will be dumped back into Windows.  You receive an error informing you that the “hl2.exe” process has crashed.  After doing some Google searches I was able to find a solution posted here and here.  The workaround is to basically shoot the web at the end of the passage, face the wall on the right, crouch, and then strafe until you get into the next room.  I followed these instructions and I was able to avoid the crash.  I love being a PC gamer!!!