*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.