New gameplay footage of Half-Life 2: Episode Two, Portal, and Team Fortress 2 is shown off in this video that goes behind the scenes at Valve’s development teams.

Newly discovered are these Black Hole Bomb weapon in Half-Life 2: Episode One. Throw it and then press attack again to activate it. It is preferable to do it in an area with lots of physics objects, I also suggest you stand back lest you wish to be crushed into singularity. Video included.