Fro those with an interest in the medical evidence:
http://mcadams.posc.mu.edu/medical.htm
Clear and concise explanations of most of the bunkum that conspiracy theorists put up as "evidence". Of course most of this follows the government line of shots coming from behind of which we are accused of sheepishly following by the OP.
Just for you Bubbles a few pictures from Zapruder (Frame 335), that might put you straight on a few of your "facts":
I see the back of the presidents head intact and a gaping wound on the upper right side of his head. What do you see?
On the subject of the head being shocked backward by a bullet entering the front of his skull, here is what the two frames before and after impact of the head shot; Frames 309 to 313:

If that is backward movement, then I'll happily eat crow. His head does rock back after this, but well after impact.
What did the Parkland doctors say when they saw the autopsy reports, photos and x-rays?:
http://mcadams.posc.mu.edu/novadocs.htm
What did Cmdr Dr. James J. Humes say when interviewed by Dan Rather about the autopsy in 1967?: