I am the proud owner of eight Lisp books, and this one is at the top of the list for learning the language, because of the exercises, and because Wilensky is a teacher and knows how to teach. You don't learn a language by reading a book, or by reading a specification, but by writing code. The chapters in 'Common Lisp Craft' are short enough to read through in one sitting, but the end of chapter exercises will keep you busy for days. The last two chapters involve real applications, and go much farther than simple beginner exercises.
Three warnings:
1. My copy is 23 years old (1986 to 2009) and environments have changed, the interface with Lisp in Wilensky is totally out of date and pretty much useless.
2. This book alone isn't enough, particularly with respect to macros, quotes, CLOS, and the like, so expect to follow it up with something else from another point of view, like Peter Seibel.
3. These is a solutions manual. Get it. You will need it.