space is very cold, granted. but the specific heat of a vacuum, is, well… zero. therefore it has no capacity to remove heat from an isolated body via conductance or convection. even in the frigid climate of space, your body would only lose heat through radiation, as in the slow emission of infra-red from your body. it would take a long, long time to freeze in the depths of space.

the boiling of nitrogen and other soluble gasses from bodily fluids would cause pain and serious injury, but it would be only marginally worse than that of a bad case of the bends. obviously, the human body is not held together by atmospheric pressure alone. bruising, rupturing of the capillaries and temporary blindness would occur, but it’s nothing that the body can’t naturally heal… assuming the subject is moved into a pressurized and oxygenated environment before the subject asphyxiates.

someone tossed into the vacuum certainly wouldn’t ‘pop’ like a balloon. like i said, atmospheric pressure alone is not what holds the body together, and the tensile strength of skin and tissue is enough to hold the modest inner pressure of bodily fluids safely inside one’s torso.

radiation in space is certainly fierce, depending on location (the van allen belts would make radiation negligible in low earth orbit). but radiation takes time to kill. the first thing to end one’s life would most certainly be the brain starving for oxygen.