If you want to get your hand strengthened (and stretched!) in no time, a few things I recommend:

Any of Allan Holsdworth's books. The lead playing isn't full of stuff that will strech your pinky/ring fire, but a lot of the chords that he plays are huuuge stretches that will help you out.

Any of Rusty Cooley's instructional cd-roms.

Same with Francesco Fareri.