Planet Analog has posted the article SPICE made easy which reviews the book "The LTspice IV Simulator - Manual, Methods and Applications" by Gilles Brocard. LT SPICE is a free SPICE simulator that does not have any limitations on component count or node count. There is a graphical schematic capture tool now too. It is very popular but isn't well documented until now. The book is available from the publisher for €49 plus VAT.