I recently finished reading The Introvert Advantage: How to Thrive in an Extrovert World, and I really enjoyed it. I learned a lot about myself, and was able to connect some of the quirks I have that I thought were just random to being very much an introvert! I hate calling people and talking to people on the phone, I much prefer writing to talking, I really hate to be in a very crowded place because it feels like a sensory overload...all of these things are connected to being an introvert. It also helped me to recognize that many of the things that are highly praised in our society are simply traits of extroverts, and there's nothing wrong with me because I don't have those traits. Nothing in the book was really life altering, but it was helpful in pinpointing why I am the way I am about many things, and understanding myself better is always a good thing! I very much recommend it to anyone who is introverted, and anyone who has to deal with introverts on a regular basis. It can help introverts and extroverts understand each other better, and be able to better communicate. It's also a very quick and easy read.
If you're interested, you can get it here.