I like this initiative. I read tons of books every year, mostly geared towards general psychology, achieving happiness, neuropsychology, and biographies of interesting people because that is what captures my attention most. However, here are some books that I've found incredibly helpful in boosting my confidence and/or ability to read people and otherwise improve social interaction.

• As A Man Thinketh by James Allen
• How to Win Friends and Influence People by Dale Carnegie (the BEST book ever written on social interaction, it's a must read if you haven't yet)
• The Definitive Book of Body Language by Barbara and Allan Pease
• What Every BODY is saying by Joe Navarro

Oh yeah, last but not least, I HIGHLY recommend for any ENFP who sees this to take the time and read Ender's Game by Orson Scott. Besides it being a captivating sci fi book AND the first book that really caught my attention since The Hunger Games and the Harry Potter series, I really related to the main character. He experiences a certain kind of loneliness that is very much reserved to the ENFP in particular, I believe. Anyways, check it out. It has over 4000 5-star reviews on Amazon.