To make things even more interesting, I found something in the Harry Potter books that supports CmonMiracle's notion that Harry could "kill" Voldemort without killing Tom Riddle.
I am in the middle of rereading the other six books so they will be fresh in my mind when I start on book seven. Here's an excerpt from the climax of book five, page 814 of the American edition:
"You do not seek to kill me, Dumbledore?" called Voldemort, his scarlet eyes narrowed over the top of the shield. "Above such brutality, are you?"
"We both know that there are other ways of destroying a man, Tom," Dumbledore said. ... "Merely taking your life would not satisfy me, I admit — "
"There is nothing worse than death, Dumbledore!" snarled Voldemort.
"You are quite wrong," said Dumbledore. ... "Indeed, your failure to understand that there are things much worse than death has always been your greatest weakness — "
With those words fresh in my mind, I'm actually rooting for Harry to suck the Voldemort out of Riddle.