A very famous book, who's techniques are used by all pianists and all music to some degree- Scales and Arpeggios (available for free on this site as a .pdf)Other than that, try your hand (if you'll forgive the pun) at some Hanon- *is shot dead by the teachers*No but seriously, try some Hanon. Don't take it as gospel, but it's decent for beginning to strengthen your hands; the major piano works require, aside from amazing technique, lots of endurance in the hands.