Clustering
Rui Xu, Don Wunsch
This book covers the range of categorization algorithms very broadly and in an easily understood fashion, but without a lot of depth. Many software packages are mentioned and given a few paragraphs each. For my taste, too many pages are devoted to summaries of various applications rather than, say, more discussion of the relative merits of the different methods for different kinds of data. Basically, an excellent introduction to the field.
