Finally I have read the book "Thoughts on Interaction Design" by Jon Kolko. It is a book filled with great essays on the nature of interaction design. The chapters cover important aspects of design and is written in a personal and easy to read language and from a perspective of someone who knows the field well.
I really like this book and I strongly recommend it to anyone who is within interaction design, either as a researcher or a practitioner. But even more, I recommend it to students in interaction or HCI design. This is such a nice introduction to the core of what it means to be a designer and how to think about digital artifacts.
Kolko addresses many of the issues discussed in the field today, and he does it from a perspective that I really like, which is a perspective grounded in a strong respect for practice, and the true nature of actually doing design. He knows design. Read it!!