I've been reading 'Attached' by Dr Amir Levine and Rachel Heller, and I have to say it's been a real eye-opener for me. Would definitely recommend it! It actually might help save you from pursuing relationships which aren't right for you, and to be more self-aware in terms of why you're attracted to people who aren't able to connect with you on a deeper level. If you're an "anxious" type and find yourself in rollercoaster relationships with those you consider to be "avoidant", you'll definitely benefit from looking into attachment theory. If you're an avoidant and cannot understand why the hell your partner is turning into a needy, dependent person... this book might help you understand why.
If you've never heard about attachment theory, do a quick Google search, and then take the test here:
Attachment Styles and Close Relationships
If you go for option B you don't need to provide your email address or anything, and should only take a few minutes to complete.
Would love to hear from people who know about attachment theory (it's something relatively new to me, so I don't know too much), as well as your experiences with people of different attachment styles. It would also be awesome to learn others attachment styles... so please do share your results