I was wondering whether anyone knows of any good non-technical or even popular expositions of the Birch—Swinnerton-Dyer conjecture, for someone with minimal background in elliptic curves. I was thinking of something along the lines of du Sautoy's excellent book 'The Music of the Primes' on the Riemann hypothesis, though perhaps catering slightly less to the layman and more geared to a mathematical audience.
(Note when I say minimal background, I just mean a senior undergraduate level 'awareness' of the group law on elliptic curves, working with curves over finite fields, and the Mordell-Weil theorem.)