I have no interest in doing FM so I don't see any reason for me to join the AAFP. However, I've heard the questions are good for the shelf. Are these questions available anywhere else?
Their journal is pretty effing amazing. Every issue provides some refresher on some important practical topic in medicine... suturing, management of heart failure, etc. etc. I learn quite a lot from it, even though I will likely not become a family practitioner.AAFP membership is like 15 bucks for (I think) all four years of school. Their journal has pretty great articles on a wide variety of clinical topics. Worth the pennies to me, but YMMV.
NEJM is also worth having, if only for the clinical correlations section. It has more basic science articles than I really care to read though, I usually completely skip those and read only the papers that tell me how to diagnose/treat patients