I read TaGR for the first time about 5 years ago. It was the first time in my life that I was able to read a book that went totally against everything that I had been told, and exactly along the lines of the way I thought things should be. If it werent for all the negative influences around me turning me into a sheep, I would have listened to my inner voice that I had been hearing since the age of 12, and gone more the way I wanted rather than the way I 'should'
TaGR absolutely annihilated the relationship I was having at the time. The daunting realisation that it was just so not going to work any more,with my revised thinking. Only a few months later I quit my job and haven't really 'worked' all that hard in years. I'm finding much more pleasure in the simple things in life, and am slowly clearing myself of the debts I had built up. (suing Barclays for £2k yay!) However I have a long way to go. I've only made my life simple. Doesnt mean I dont want an M3, and boat, yada yada; the list goes on lol.
Anyway, Think and Grow Rich is, in my mind, great. I always recommend it to people and have bought it for 3 people already, and read my own copy about 5 times.
Throw in Rich Dad Poor Dad as well and ur golden. there are tons of others as well of course, but theyre the two that really 'converted' my thinking totally.