Thanks to Hurricane Ernesto, the launch has been delayed. However they're leaving the shuttle at the launch pad to ride it out, as the winds are not expected to be as severe due to the changing course of Ernesto.
Possible launch dates are Sep 6, 7 or 8.
Full story, plus an amazing picture, here:
http://www.nasa.gov/mission_pages/sh...ain/index.html
Imagine driving along that road and seeing the shuttle like that, what an amazing sight.