This book is unique in that it offers a very good overview of Common Lisp concepts for beginners and professionals alike. There is some pretty advanced content

This book is unique in that it offers a very good overview of Common Lisp concepts for beginners and professionals alike. There is some pretty advanced content in there presented in a very succint way. As for the date, please know that this book is about ANSI Common Lisp. That is it is about a standardised language. It is not implementation or hardware specific. Therefore 90%+ of the content is relevant today as it is when it was written. That is simply the nature of Common Lisp. If I was to make a Common Lisp lecture I would use this book and expand on the content where apropriate.