The Innovator's Dilemma

About disruptive products and why it is that they always usurp the incumbents. Some great detailed case studies really help get the message across. My only criticism is that Christensen's writing style is long-winded and repetitive. Despite that, well worth the read.

Interesting and nerdy in a good way. A bit too repetitive and has too many examples to reinforce every point.

This is one of those books that you hear so much about that you're already familiar with the ideas before you even pick up the book. Alas, what you might read in summaries is exactly what you get when you read the entire thing - albeit in more words.