Since the author quoted me a few times in this article, how can I not like it :-)

For certain types of problems (e.g., graph theory, circuit design, general layout problems, planning) Prolog's built in backtracking and flexible type system does make it a very good programming language choice. My favorite example: I once spent over a month writing a planning system with nice interactive graphics in Common Lisp. After I was done, I recode the whole thing in Prolog in less than a week, adding lots of new functionality.

There are many good programming books, one of my favorites being "The Art of Prolog" by Sterling and Shapiro. Also, Bratko's, Clocksin's, Mellish's books are all very useful.