It might sound childish but remember, harry potter is a child book, so i think harry cannot die. in the end, it should be voldemort that dies, aiight, maybe what skinny said is possible, but harry can'T die. just think about it, imagine all the children crying over harry's death....
for those who like mangas, take this example, in the serie Rurouni Kenshin, book number 24 i think, the writter killed Kaoru, one the most important characters. fans didn't take it and sent treathening letters to the writter, they said that they would boycott his work and persue him in justice (sorry for my bad english), so the writter had to re-edit the book in order to make Kaoru livre, he had no choice since the readers were getting mad.
Maybe J.K.Rowlings feared something like that so she can't make harry die.
Well i think Harry will survive in the End.... anyways, we'll see, in ... 5 or 6 years when book 7 come out, :P
cya