*The Princeton Companion to Applied Mathematics*
I have not yet had time to peruse my copy, but it appears to be a definitive achievement of sorts, 994 double column pages. The topics include the Navier-Stokes equations, communications networks, the Black-Scholes equations, finite differences, foams, the flight of a golf ball, and the mathematics of sea ice. The book’s home page is here. The lead editor is Nicholas J. Higham.