If you are interested in improving your writing, I highly recommend this book: The Writer's Portable Mentor: A Guide to Art, Craft, and the Writing Life. I read several sections aloud (yay!) over the weekend, while my long-time-friend-and-former-roommate and I drove across Oregon. We created our own writer's retreat.
It was a great three days in the mountains of central OR, and we both made progress in our writing (she fine-tuned the structure of a few passages in the book she's working on, and I decided what direction I want to go with all the bits and pieces of writing I've done over the last several years). BIG steps in the right direction.