My top favorites (currently, of course) in no particular order:
1. The Iron Dragon's Daughter, by Michael Swanwik: Steampunk and magic gone amoke. Really dark, but so well written, about a human slave who labors in a steam dragon factory.
2. The Springboard in the Pond: An Intimate History of the Swimming Pool, Thomas A. P. van Leeuwen, MIT Press.
3. Roman Woodworking, Roger B. Ulrich, Yale University Press
4. The Ashley Book of Knots, Doubleday.
5. The Aesthetics of the Japanese Lunchbox, Kenji Ukuan, MIT Press
6. Case Study Houses: The Complete Program, 1945 - 1966, Taschen. The hardcover will cost you around $150, but worth it.
7. The Workbench Book: A Craftsman's Guide to Workbenches, Scott Landis, Taunton
8. Shelter, Shelter Publications. Very counterculture-y and facinating.
9. JRR Tolkien - all (except perhaps the Hobbit)
10. Gormenghast trilogy, Mervyn Peake. Can't speak highly enough about this writer and his works. Dark, very sophisticated gothic stuff. One of a kind brilliant mind, totally original and perhaps not for every taste, cut far too short.