Wow. The Small Farms Library looks like it has lots of information!
I just purchased The New Organic Grower - thanks for that fiveandahalffarm!
I'm about halfway through Teaming with Microbes and man have I learned a ton already. I've learned about bacteria, fungi, protozoa, nematodes, arthropods, earthworms, gastropods, and how they all affect the soil. I'd highly recommend this book to anyone looking to learn what actually happens in the soil. As a side note, I've also taken a strong stand against roto-tilling and double-digging after reading this book.