+1 to Godel Escher Bach
Unknown Quantity by Derbyshire, I believe he has another book out for Riemann's Hypothesis
anything by Martin Gardner (may be more appropriate to younger students, but definately interesting!)
But the new developments in 3D printing and other DIY hardware innovations may could chnage all this by opening the door to DIY hardware. Just as VLC makes the issue of whether Windows Media Player can play pirated DVDs obsolete, freely downloadable blueprints for open source iPods that can be "printed out" on a desktop rapid prototyping device could spell the end for hardware monopolies.
This article by Charcoal Design explorers the evolution of consumer technology over the last 20 years, and suggests that desktop manufacturing of simple electronic devices such as media players could be the next big thing to hit the consumer hardware market.
The device described could handle voice over internet phone-calling. He said it is being developed within a 100-person mobile phone group at Google that includes Andy Rubin, the creator of Sidekick, a popular phone and internet device that he developed at a prior company he founded, Danger Inc.
"Mobile is an important area for Google," Google spokeswoman Erin Fors said on Friday. "We remain focused on creating applications and establishing and growing partnerships with industry leaders to develop innovative services for users worldwide. However, we have nothing further to announce."