Coincidentally enough I was reading the Wikipedia article on space exposure just last night.
Few humans have experienced these four conditions. Joseph Kittinger experienced localised ebullism during a 31 kilometres (19 mi) ascent in a helium-driven gondola. His right-hand glove failed to pressurise and his hand expanded to roughly twice its normal volume accompanied by disabling pain. His hand took about 3 hours to recover after his return to the ground.
The article on uncontrolled decompression is quite informative too and covers some of the myths surrounding explosive decompression. Seems like human bodies are quite resilient and our skin can handle a drop of one atmosphere. Although I'm not about to volunteer.