The Stock Market Philosopher was written before the current market events but it is an even better read in light of them. I highly recommend.
I have a working system that serves me well too. But I always am interested to read up on other people's work. I want to know if there might be other ideas out there that help me enhance mine, or give me a new way to trade. I wouldn't have what I have today if I was contended with my original system. I try to learn something new everyday. Though many books out there just repeat the same sets of concepts. I usually skim through the material. Occassionally I found some gems that delight me. And thanks for sharing.