Well, Highlights and Nintendo Power, and at one point I got the Dungeons & Dragons magazine. All of those are from wayyy back though, before I became (supposedly) an adult with a job. 
I don't subscribe to any due to limited storage and reading time, but I've been known to browse my parents' Scientific American and National Geographic. To no small extent, I think the factors mentioned earlier in this thread--the Internet, increased number of adverts, less content and more glossy images--have all contributed to their relative decline.

I don't subscribe to any due to limited storage and reading time, but I've been known to browse my parents' Scientific American and National Geographic. To no small extent, I think the factors mentioned earlier in this thread--the Internet, increased number of adverts, less content and more glossy images--have all contributed to their relative decline.