Listmania!
Confidence? Social Skills? Seduction? You got it!
The Natural Art of Seduction: Secrets of Success With WomenThe Natural Art of Seduction: Secrets of Success With Women by Richard La Ruina
Buy new: £5.19 / Used from: £2.64
The best PUA book going, really detailed, fun to read, and wonderfully inspiring, and really well priced.
The Power of Now: A Guide to Spiritual EnlightenmentThe Power of Now: A Guide to Spiritual Enlightenment by Eckhart Tolle
Buy new: £4.98 / Used from: £0.12
When it comes to inner game and motivation, nothing's better
How to Win Friends and Influence PeopleHow to Win Friends and Influence People by Dale Carnegie
Buy new: £4.48 / Used from: £3.30
Stood the test of time. Best of it's kind and really easy to read because of all the well divided sections
Introducing NLP Neuro-Linguistic ProgrammingIntroducing NLP Neuro-Linguistic Programming by Joseph O'Connor
Buy new: £7.77 / Used from: £4.49
Really in depth, a bit heavy sometimes but all the information you need to start applying NLP
How to Talk to Anyone: 92 Little Tricks For Big Success In RelationshipsHow to Talk to Anyone: 92 Little Tricks For Big Success In Relationships by Leil Lowndes
Buy new: £5.29 / Used from: £1.68
Really good for general social skills, not as refined for intimate relationships as most but very powerful indeed
Instant Confidence  (Book and CD)Instant Confidence (Book and CD) by Paul McKenna
Buy new: £5.84 / Used from: £1.73
This is worth it for the hypnosis CD alone, excluding the excercises. But it will give you more direction.
The Art of WarThe Art of War by Sun Tzu
Buy new: £3.00 / Used from: £2.69
Very quick read and really useful in business, but also in day to day relationships
The Art of Speedreading People: How to Size People Up and Speak Their LanguageThe Art of Speedreading People: How to Size People Up and Speak Their Language by Paul Tieger
Buy new: £8.59 / Used from: £4.94
The pscyhological types helps you understand others really fast as well as understanding yourself