Note: I am ONLY recommending books that I have read at least once in full. Most of these I have read and referred to many, many times.
Also note: This section is a continuous work in progress. I am adding books daily! There are so many incredible books that it will take me a long time to catch up to the ones I've previously read that I believe deserve note, not to mention any new ones I will read from here forward. For instance, I will be adding many Robert Anton Wilson and some Deepak Chopra books soon, when I have the time to track them all down and post a link.