Some that I've read recently and would recommend:
1. Well Tempered Keyboard Teacher, by Uszler, Gordon, and McBride-Smith
2. Mastering the Art of Performance, by Stewart Gordon (this isn't necessarily a pedagogy book, but still very good)
3. The Pianist's Problems, William S. Newman (this one is old - again not necessarily for pedagogy, but has some good ideas)
4. With Your Own Two Hands, Seymour Bernstein
5. Professional Piano Teaching, Jeanine Jacobsen (focus on beginners)
6. Thinking as You Play, Sylvia Coats
I have other suggestions as well, but these are some that I have especially enjoyed reading.