Silent Letters of the Alphabet by Ruth Padel - Essays on poetry & how it works, originally presented as lectures. I found the reflections on metaphor, blank space, & voice useful in thinking about the word-by-word craft of writing. Wider points on the nature of poetry were interesting, & it was good to have someone make me think beyond the forms I understand. Read if you're interested in how poetry works, or the micro-scale craft of wordsmithing.