The Photographer's Guide to Filters by Lee Frost (2002)

With a shift to digital SLRs in the recent years, many photographers are content to point and shoot, and then "enhance" the image later using software. While there is nothing wrong with this approach, there remains a degree of satisfaction of getting the exposure exactly as desired using only the camera itself. Filters play a huge role in making this happen.
Frost's book does provide a good introduction to the use of filters. The images in the book at times, provide an excellent compare and contrast between filters used to get the exposure and not used. For the amateur, the differences between some of the examples may be hard to see.
Although the writing is not bad in the book, Frost has a tendency to be too "heavy" with the brand and exact specifications of the filters he's exploring: great for the professional, intimidating for the amateur. A more "final exposure" based approach (e.g. you want the image to look like this, use this filter) would provide more value to the majority of readers.