Wow this is a tough one, I cant choose just one damnit!
Johnny Mo: Split in half like a fish death! SPLASH!
Go Go: table leg with nails to the melon death! WACK! I also love how the bloods running out of her eyes.
O-Ren Death: Chopped off Top death!
Buck: Melon mashed in the door death!
Trucker: The Bride gave him lip service death!
Vernita: Throwing SOG knife to the chest death!
Other great mentions: The Brides opening Crazy 88 battle Eye popper, Sofie Fatales arm getting chopped off, Bride picking up Crazy 88 like a shish ka bob, Go Go gutting Japanese guy like a fish, Anime Oren killing those Yakuza gang bangers, Oren shooting a hole in that mexican guys cabeza (great POV shot!! lol). This movie is a opera of blood!!! 
