Let me first list a few things that changed my life for the better.

In Terms of books and Material, it was mostly:

1) Introducing NLP by Joseph O'Connor and John Seymour (not exactly scientific psychology, but very helpful and the concepts get used in the whole PUA / Seduction community)

2) Learning and Behavior by James Mazur (thats one of my favourites, ends up with you having your outer behavior under a tremendous amount of control)

3) Evolutionary Psychology by Buss (includes tons of stuff about mating strategies and such)

4) Tranquil Mind by Rob Nairn (will teach you mindfulness meditation which will lead you down a path to a lot more peace of mind, a lot more stress resistance, and it will shut down a tremendous amount of negative thought loops for you if you follow it through. Overall, your life satisfaction gets a huge boost.)

Besides that, life-wise, the most profound experiences I had, was overcoming the pedestal and finally getting abundance mentality. From my experience, you can absorb these concepts pretty quickly, but it took me quite long until it basically hit me on the forehead. There's just some point where you really understand this, and what it's about, and you immediately see the truth in it. Bam, just like it hits you. It's not even a terribly pleasant experience, since you also need to take into consideration you've been doing it all wrong (heh), but those two life-changers came from Pickup.

Besides that, collecting tons of smaller "reference experiences" was also helpful.

What were your Life-Changing books and experiences?