Joe's 2nd Book for the C64 by Joseph E. Gordon - This book is a collection of tips, reviews and type-in programs from various sources.  I'm not so sure this should be considered a book in the traditional sense because what it covers is so broad and really not in much depth.  It seems more like a diary of things Joe has worked on or played with since his 1st book.  All the same, it has some good information and references some interesting and useful software.

Here's a link to Joe's First Book for the C64