"Designing Design" by Kenya Hara. Design from a very Japanese point of view, written with an occasionally humorous colloquial spin. This book, I have discovered, is nearly impossible to find in the US for under a few hundred dollars. But thanks to eBay Japan, I found a copy for a lot cheaper, and signed by Kenya himself!
"Discovering Design", a collection of essays edited by Richard Buchanan and Victor Margolin.
"Objects of Desire" by Adrian Forty.
Almost finished with this one. The perfect concise history of industrial design since the Industrial Revolution.
"The Sense of Order" by E.H. Gombrich. The next book on my list, which I'll finally crack open really soon. Amazing cover!