The best inspirational book i have read till now is "Power Of Now" by Eckhart Tolle...
It emphasizes the advantage of living in the present rather than thinking about the past which is way gone behind and about the future which is yet to come. A simple book written in a lucid language but with a powerful message and techniques to live in present.
I tried incorporating some of the teachings from the book and it worked really well for me at least .
