Ok i'm posting this here cause mutlitple people have asked me about it.  This is a macro that will basicly cover everything for you and yes it will probably increase your dps by at a minimum of 100. I didn't believe it till i used it on my hunter and i went from 800DPS on avg to over 1Kdps.  Hope this helps.

Take the button for MACRO 1, place it somewhere you can mash it endlessly.

Take the button for MACRO 2, and place it on the last button space (right hand side) of Action Bar 6.  If you have your action bars expanded out, collapse them, go to the 6th tab of buttons, and place it in the last spot.  If you have an addon or mod that changes your buttons, turn it off, place the macro in the proper place and then reload your addon.

Macro 1 is spammed, with a 2.9 weapon as a BM hunter (Sunfury, Steam Pistol, etc.) with as close to 2.0 attack speed as possible.  Macro 1 will automatically trigger Macro 2 when Kill Command is available, and will also guarantee no clipped Auto Shots or macro hangs when the Kill Command goes off.

One MAJOR benefit to this macro - Kill Command and all hunter shots are on SEPARATE macros - meaning if Kill Command "locks" - your shots are not locked with it!  You can continue to fire, usually getting another critical strike within a few moments, and "unlock" Kill Command.  Occasionally you will still end combat in a "locked" state, where you will not be able to feed your pet, open chests or doors, etc.  This is a KNOWN BUG that Blizzard is currently in the process of fixing (supposedly) - to unlock from this state, you must either (1) enter combat, get a critical strike AND cast Kill Command, or (2) Re-log via ALT-F4 (you can't even hit Esc to access the options menu while "locked).

The other key thing to note - SEPARATED MACRO ALLOWS YOU TO DPS A DIFFERENT TARGET THAN YOUR PET.  Your macro will mess you up if you try to use it on a target other than the one your pet has, and will end up changing your pet's target to your own, and sometimes changing your target to your pet's.

If you use a Wind Serpent, you can use this line in the first macro to autocast Lightning Breath on whatever target your pet is currently attacking.  You will of course want autocast of LB off so that your pet does not back out of melee range to attempt a cast.  Please note that this will not trigger if your pet is not currently "engaged" with a mob, but that if you want, you can have the pet stay by your side and cast off LB from range by removing the [target=pettarget,exists] and making the command a /castrandom rather than a /cast.