Sign Language Interpreting: Exploring Its Art and Science by Stewart, David, Schein, Jerome D., Cartwright, Brenda E. [Pearson, 2003] (Paperback) 2nd Edition [Paperback]
This is a great read of a book. Almost good enough to just pick up and read, though I'm not sure why you'd want to unless you actually wanted to be an interpreter.
The one flaw is that it needs an updated version, now that the Code of Ethics has been re-done. You don't miss much, since the new Code of Professional Conduct is based off the same principles that the old Code of Ethics was. Reading the chapter was still helpful. But it could use some revising now that there's a new code.
Also, the list of interpreting certifications in the back is already outdated, but I'm not sure there's a way to stay on top of that. Seems like those change every 5 minutes.
I learned a ton about the role, mechanics, dynamics and business of interpreting from this book. While I'm not yet sure (still) if interpreting is a right fit for me, I have a much better understanding of the profession. Like another reviewer said, you could *almost* pick this baby up for fun--but why would you unless you've already drunk the Kool-Aid?
A more recent update of research, trends and technology would make this 5 stars.