As far as the intangible benefits of heating with wood, I can't believe no one has mentioned this (or maybe I missed it): the radiant nature of wood heat is vastly more comfortable and satisfying than blowing hot air through the house. Not to say that all wood heat is radiant (e.g. if you're not in the same room as the stove) or that wood is the only way to achieve radiant heat (e.g. steam radiators).