Looks like an updated version of his 1998 book "Introduction to Functional Programming using Haskell":

http://www.amazon.com/Introduction-Functional-Programming-us...

The 1998 book was excellent, except that it came just before Haskell 98 and so one or two examples needed a little modification before they would build with GHC, but really it was a paper and pencil type of thing. I read the whole thing sitting in a copyright library without a computer because the book was two expensive to buy and was not in my university library. Looks like that won't change with this update.

On your quest I'd recommend the following: http://www.amazon.com/gp/aw/d/0134843460 http://www.cs.yale.edu/homes/hudak/SOE/ http://book.realworldhaskell.org