I'm not sure that "inspiring" is the word I would use for my experience with them but I have certainly had a couple of "lightbulb" moments. One thing I took away from my reading of The Celestine Prophecy was to be more willing to engage with people if you both seemed to have that unspoken urge to communicate. I have found on many occasions that we have had info that the other person was needing. Quite nice really.
I guess it depends on the book and on a specific person's life situation. I bought two years ago by a writer called Susan Jeffers - 'Feel the Fear and Do It Anyway' and 'End the Struggle and Dance With Life'. They were both very interesting, and were full of inspirational words about living a more vibrant, positive and fulfilling life. So many people find themselves in a complete rut in their life, and books such as these can often inspire readers to be more creative, loving and dynamic - both in their own lives, and in their relationships.