I recently published a review of the following book in EE Times.
One of the most popular versions of SPICE today is Linear Technology’s LTSpice IV. This free and full-featured SPICE modeling software runs on PCs and includes schematic entry, great graphical plotting, and is very fast. While Linear Technology provides a basic on-line user guide, until now, there really hasn’t been a very comprehensive resource on using the software. Earlier this year, components supplier, Würth Electronik, alleviated this missing reference with their 700+ page book, The LTSPICE IV Simulator – Manual, Methods and Applications by author Gilles Brocard.
The software will run on either PC or Mac. To read more and add your comments, click here…
The book, The LTSPICE IV Simulator, by Würth Electronics.
design-4-emc.com 
This is a great book, very useful to explain many concepts and ways LTSpice IV works. It’s nice too, that LT Spice IV works wonderfully on Linux (under WINE) !!
Nice review on the book, Ken, thank you!