Different characters, different methods. Alignment plays a huge part, too. Take a few of my methods, for example -
Human Bonewarden (class of my design; ultra-specialized Necromancer.) - Neutral (not evil, but morbid. VERY macabre.)
Evisceration is the first term that comes to mind. Mostly for study, with the occasional useful bit turning up (several parts of, say, a Red Dragon have fiery qualities; I once converted a small Dragon head and a few choice parts into a makeshift flamethrower when some other monsters showed up after the kill). If I'm short on minions, raising the body myself is an attractive option, but usually it just gets cut up. I tell the party to leave me alone for a few minutes (in-game, of course. The characters had a problem with this at first, but they grew to accept it, not really wishing to see the careful dissection of a particularly odd monster. They don't ask what happens to the body, I don't tell). After cutting up and examining the body for a minute or two, it's usually too mangled to even consider resurrecting. Of course, True Resurrection is still an option, but we won't have to worry about zombies, skeletons, or that person ever coming back, short of True Resurrection. Seeing as it's a bloody pulp, I kick a little dirt over it if we're just passing through, and if we're bedding down nearby, I gesture at the general area, and the party Wizard knows what to do (lob a fireball). After the looting, the corpses are my domain, freeing the rest of the party from the grim duty of dealing with the cadavers, and giving me precious resources. For mundane bodies of average creatures, I usually just raise them or have somebody incinerate or do whatever to the bodies. Despite the fact that I creep out the rest of the party, they're glad to have me, mostly for power, but partially to avoid body duty.
Detail never hurts, and it really gives an idea of the character. Nothing brutal or crude, just pure curiosity and thriftiness. Come on, don't tell me you've never wanted to see what makes a Chaos Beast tick!