Nature

I've subscribed to Nature for about a decade, now.  It predates my biology degree, so there was a good span of time where I bought it not for the articles, but unabashedly for the photos.  I remember it was because I kept hearing news stories lead in with "as reported in the journal Nature, this week," and I wanted to get it directly from the source.  It's not a cheap subscription, but for me it's a keeper.

Nowadays, my friend justkristin gets my hand-me-downs after I read them.  Most weeks, I add a post-it on the front, identifying my favorite item inside.  And although I understand the science content now -- a good set of photos is still just as sweet.  Ah, science pr0n.