The question of getting rid of a body correctly came up in my Anthropology class. Our professor is the State's Forensic Anthropologist.
He stated that inceneration is good, being meticulous with the clean up. Crush the ashes into a fine powder and spread into a water source, preferably a river. Possibly miles apart at a time. He said to make sure that the incenerator is cleaned and reused soon with other things, dead animal carcaus and such. Oh yea, make sure you clean out any fillings from teeth, remove all jewelry, and check for screws/pins/rods placed in bones.
**Glad I wrote all that down!