Abraham Pais offers a sketch of the life and work of Dirac, who was a personal friend. Maurice Jacob writes about antimatter, describing Dirac's role in its prediction and its place in modern theory, its role in cosmology, and its uses in experimental technology (notably colliders) and medical applications. And David Olive outlines some recent theorising about magnetic monopoles.
These three papers are technical, but their gist should be comprehensible to anyone with a basic physics background. This is not true, however, of Michael Atiyah's paper on the role of the Dirac operator in Riemannian geometry, which is really only for the mathematicians. The collection as a whole is a little eclectic, but should have something for anyone with an interest in modern physics.