For the past 3 years or so, I have been writing a popular mathematics book, "Visualizing Mathematics with 3D Printing". It's an accessible introduction to some very beautiful ideas - symmetry, polyhedra, the fourth dimension, tilings, knots, surfaces and so on. The twist is that most of the figures in the book are photographs of 3D prints, almost all of which I made through Shapeways. This collects together much of my work over the past few years, and explains how they all fit together!
The book is now available for preorder through Amazon: