Marti Hearst just completed her new book Search User Interfaces. Additionally, you can read it online free! Marti is a professor at the UC Berkeley, and a leading expert on user interface design for search. To go with a book she's started a blog, SearchUpTicious.
I've been waiting for this book a long time. I remember talking with her about it back at SIGIR 2006. More to come, in the meantime go read it for yourself. Daniel also has an early review.
via Matthew Hurst.