If you want a great summary of the book, I highly recommend this post: Piketty Explained: Summary of Capital in the Twenty-First Century by Thomas Piketty.
It’s superb. Peter Shirley, the author, has written a 30 second summary and a 15 minute summary, and when you finish both, you will have a very fast but very thorough introduction to the book. I am going to come back to this from time to time as a refresher to what I read in the book (as well as flip through the book again). Did you read Piketty but skip sections? Then review Peter’s post to see what you missed.
More good reasons to pick up Piketty before 2014 ends.
(The chart on world growth rates is from a link to Peter Shirley’s blog post.)