When i saw this post, i thought it would be about the ending.......
Right,right,right at the end of game, you see the image of Aeris from the beggining.
Does this mean that the life-stream ressurected her??
In any-case the myth about bringin her back is complete pooch-screw. On the PC version you could probably find an easy hack, but there is no method, no matter how labourious or long winded of bringing her to life.....
So there.