First off, shame on you; it is VERY bad to run a fuel injected vehicle
out of gas. Now here's the remedy:
The same thing happened to a buddy of mine with a 2001 Cavalier. What
you have to do is build the fuel pressure in the system back up to what
is necessary
to power the engine(I think around 37-45 psi). How you do this is you
repeatedly turn the key to the "run" position, but DO NOT START IT.
That will only wreak havoc on your fuel system and starter. Leave it on

until you audibly hear the fuel pump safety switch turn off(the thing
that kills your fuel line if your engine dies or if you are in a
wreck).
Do this about THIRTY times, and by then, the pressure should be built
up enough to try and start it. If it does not start almost immediately,

assuming it's not cold out and all that, then repeat the previous
step for about another five minutes or so. After you get the car
running, make sure to have a mechanic inspect the fuel pump, as this
procedure is very hard on it.

The Freak