So many to choose from, and so many coming out month after month. The following are some 'classics' and a couple of personal favorites.

The titles are linked directly to Amazon so you can read a few reviews and/or buy a copy if it appeals to you... I love Amazon, it's a great place to pick-up design books!

Norman, Donald A. (1988). The Design of Everyday Things. New York, NY: Basic Books

Betsky, Aaron and Adam Eeuwens. (2004) False Flat: Why Dutch Design is so Good. New York, NY: Phaidon Press

Demetrios, Eames. (2001) An Eames Primer. New York, NY: Universe Publishing

McDonough, William and Michael Braungart. (2002) Cradle to Cradle: Remaking the Way We Make Things. New York, NY: North Point Press

Nelson, George. (2003) How to See: A Guide to Reading Our Man-Made Environment. Oakland, CA: Design Within Reach