I get emailed KevinMD's feed a couple of times/wk. It's a nice mix, includes one MKSAP style question and MedScape's top ten.
And I second NEJM, worth every penny for a student membership, you can set your account to email specialty-specific article updates as they are published. More importantly, their search feature is superior to JAMA's if you need an article on a specific topic. And their photo questions are fun, if impossible for me to get right most of the time.
NY Times health section has great stuff.
Mens' Journal beats the crap out of Maxim. You don't need to pay for pictures of hot chicks, you might as well pay for articles instead. But what do I know, I don't have a Y chromosome. 😀