Reduces the cooldown of your Rapid Fire ability by 1/2 min. In addition, after killing an opponent that yields experience or honor, your next Aimed Shot, Arcane Shot or Chimera Shot causes 10/20% additional damage. Lasts 20 sec.
While the bonus damage on your next shot is not the reason this talent is taken for PvE DPS, the damage bonus can still be put to good use. If you use [Kill Shot] to "steal" killing blows on targets, you will (in addition to the high damage dealt by Kill Shot) significantly increase the damage of your next shot. Since the buff lasts 20 seconds, you do not have to use a single target shot right away. This is especially useful in AoE situations where you are mainly using [Multi-Shot] but still want to "snipe" targets with Kill Shot for maximum damage.
Since Chimera Shot deals the most damage of all the shots affected by this talent, and so should ideally be your next shot fired after killing a target.
This talent can be somewhat inconvenient while leveling, as the extra damage makes it more likely that you pull aggro off your pet. You can avoid this, and even turn it to your advantage, by using [Misdirection] once you get it.
Old: Reduces the cooldown of your Rapid Fire ability by 1 min. In addition, after killing an opponent that yields experience or honor, your next Aimed Shot, Arcane Shot or Chimera Shot causes 10% additional damage. Lasts 20 sec.
Patch 3.0.2 (2008-10-14): This will now proc off Chimera Shot, but no longer works with auto-shot.
[Rapid Killing].
[Aimed Shot], 
[Arcane Shot], 
[Chimera Shot], 
[Rapid Fire]
[Kill Shot] to "steal" killing blows on targets, you will (in addition to the high damage dealt by Kill Shot) significantly increase the damage of your next shot. Since the buff lasts 20 seconds, you do not have to use a single target shot right away. This is especially useful in AoE situations where you are mainly using 
