For biz, I like Guy Kawasaki's Building the Dream, and his other book, "Rules for Revolutionaries". It brings your mind to a different playing field and head and shoulders above your competitors.
For personal montivation, Tim Ferriss' 4 hour workweek is pretty motivational.
But the most motivational thing I do every day is list the tasks I need to accomplish that day and check them off as they're completed. With that I can see and feel the progress I'm making and how I'm getting closer to achieving my goals.
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I like reading something that can be applied to many aspects of my life. Blink is one of my favorites. It's about how, without realizing it, we make quick assumptions in the "blink" of an eye, what "gut feelings are and what they mean.
is "Think & Grow Rich" by Napoleon Hill. He interviewed people like William Wrigley, Alexander Graham Bell, etc. and developed 17 success principles which in my opinion are still inspiring.
Those are two of the best. I've read Brian Tracy but found him to be repetitive.
I have a few other motivational books on the shelf waiting to be read.
Funnily enough my greatest motivation recently has come from reading property investing books. Reading about property and long term wealth really lets you see that websites really do bring money in rather quickly, compared to property anyway! That taught me patience and perserverance.
I am a huge fan of "The Secret" especially the chapter about your relationship with money.
Then is "The New Science of Getting Rich" revised for the 21st century. I never read the older version so I can't compare both of them but the new version is really a good read.
The third is "Law of Attraction: The Science of Attracting More of What You Want and Less of What You Don't" by Michael J. Losier. This similar to the secret but this one provide some exercise for you to practice.