While I have absolutely no problem purchasing a product that I deem valuable (here's to products, like Joel Comm's, that I've purchased for $97+, in the past), believe it or not, I can also attribute alot of my success online to products that have been provided free of charge. Regardless of where you found it (Warrior Forum? a Website/Blog?), what are the best free eBooks you've read? (Even if you didn't necessarily read them "recently"?) Would you recommend them to others?