There is an older version of the manuscript available if you scour Google.

Then there are also the videos that accompany the text book, which can be accessed by anyone. [2]

Because learning a language like ML is for the express purpose of thinking differently its likely beneficial to learn the language in a domain you might be unfamiliar with - possibly somewhat academically, instead of building an application from scratch. ("Oh I know how to solve this problem... I'll write an if-then-else statement with a bunch of branches!" vs. "Pattern matching in a case statement? List deconstruction and matching? This looks interesting.")

1. http://www.amazon.com/Discrete-Mathematics-Functional-Progra... 2. http://cs.wheaton.edu/~tvandrun/dmfp/