Regarding Mr. Pinks Survival
[quote name='US.IMDB'] SPOLIER: It can be assumed that Mr. Pink is not shot after he flees the warehouse; although you hear gunshots, he can be heard very faintly yelling something to the effect of "? give up" shortly thereafter.
SPOILER: According to Tarantino, Mr. Pink does in fact survive. You can verify this by increasing the volume of the background sounds: When Mr. Pink runs out of the building with the diamonds, police officers can be heard shouting at him to put his hands on the ground. Gunshots can be heard, then Mr. Pink shouts that he has been shot. You can then hear the officers talking to each other as Pink is arrested.
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Regarding the mystery shooter at the end
*SPOILER TO RESEVOIR DOGS*
Being as though I just saw the movie, and said the same thing. My opinion is that
Mr.White (AKA Harvey Keitel) would have to have shot Joe seeing as that Joe's gun was pointed at Mr.Orange, and White's was pointed at Joes, giving him the upper hand, and in this case the killing shot. However Nice Guy Eddie(AKA joe's son) would have to have shot Mr.White, being as though he had originally been pointing at him, and was itching to shoot him(though for some reason he shot him center mass, instead of the head). Now all that makes sense, but add Nice Guy Eddie getting shot, and you have your Paradigm. The only a few possible explanations are as follows
Mr.White---->Joe
Joe----------->Mr. White(Optional)
Mr.White---->N.G Eddie
N.G Eddie--->Mr.White
The above reasoning is based that upon being shot by Nice Guy Eddie(after white shot joe), Mr.White popped off another round, and killed eddie
The following scenario is based upon the fact that Mr.Orange had with him, a small derringer like pistol...
Mr.White---->Joe
N.G Eddie--->Mr.White
Mr.Orange-->N.G Eddie
However I did not see any muzzle flash coming from Mr.Orange's general direction, though I believe Nice Guy Eddie was blocking the view. I also did not count the amount of rounds fired, nor remember exactly what direction the guns were pointed in...so I could be off
*SPOILER TO RESEVOIR DOGS OVER*
Great Movie Though,

ing Awesome