I find that Practical Common Lisp has not aged well. Maybe it's the "practical" part with the specific examples the author used -that are now terribly dated- that is mainly responsible, but the end result is that I no longer recommend it.

My goto recommendation for newcomers is Norvig's PAIP which is full of insightful moments and unbelievably good code and for people with more experience "Let over Lambda" by Doug Hoyte, which is a mind-blowing book mainly because of the time-transcendent nature of the examples Doug chose.