Highly rated books published more than 15 years ago.

The Tipping Point: How Little Things Can Make a Big Difference Malcolm Gladwell
The Elements of User Experience: User-Centered Design for the Web and Beyond Jesse James Garrett
The Design of Everyday Things Donald A. Norman
Purple Cow: Transform Your Business by Being Remarkable Seth Godin
Cradle to Cradle: Remaking the Way We Make Things Michael Braungart