This is a good article on why Apple hates buttons. It starts off about the iPhone but delves into Apple's core principles.
http://online.wsj.com/article/SB1185..._editors_picks
"I don't know that there's ever been a slide that captures what Apple's about as much as this one," he said. Mr. Jobs was wearing the button-free long-sleeve black shirt that has been his trademark at public appearances. A Microsoft spokeswoman said the company declines to comment on the button issue."