An alternate ending to I Am Legend has surfaced on the web. You may check it on:

I Am Legend Alternate Ending

Plot Summary:
“Robert Neville (Will Smith) is a scientist who was unable to stop the spread of the terrible virus that was incurable and man-made. Immune, Neville is now the last human survivor in what is left of New York City and perhaps the world. For three years, Neville has faithfully sent out daily radio messages, desperate to find any other survivors who might be out there. But he is not alone. Mutant victims of the plague — The Infected — lurk in the shadows… watching Neville’s every move… waiting for him to make a fatal mistake. Perhaps mankind’s last, best hope, Neville is driven by only one remaining mission: to find a way to reverse the effects of the virus using his own immune blood. But he knows he is outnumbered… and quickly running out of time.”

Well I prefer the official ending…
:-[

I Am Legend
Action/Thriller
Directed by Francis Lawrence
Starring Will Smith, Alice Braga, Salli Richardson-Whitfield, Willow Smith, Charlie Tahan
Release Date: December 14, 2007

More Information at: I Am Legend

http://i-am-legend-trailer.blogspot.com

I AM LEGENDPlot Synopsis:
“Years after a plague kills most of humanity and transforms the rest into monsters, the sole survivor in New York City struggles valiantly to find a cure.”