Bill Moggridge recently released his highly anticipated book called Designing Interactions (which along with books like Getting Real, and offerings from Maeda, Saffer and Brown are making it a banner design book year). Moggridge takes us through the history of this young field by engaging with the people that helped shape it. It's amazing to read some of the chapters and realize the leaps of faith that folks still had to take despite reams of research and insight into users and customers.
One highlight of the book is the inclusion of a DVD that contains interviews with all the people profiled in the book. My personal favorite is the one with Bill VerPlank. Which can also be seen here. Where you mean to somebody this year? Do you need a last minute gift idea? Buy this book, it will remind you of how far interaction design has come in such a short period of time.