Just like everyone else, I subscribe to The Economist for all of the reasons elucidated in far greater detail elsewhere.

Unlike everyone else on the thread so far, I also subscribe to GQ because a) the articles are periodically interesting and have nothing to do with technology, b) just because I write software for a living doesn't mean I can't wear Diesel or Marc Jacobs (and GQ helps me stay on top of such things).

I used to subscribe to JPG Magazine, but never re-renewed after they stopped publishing for a few months.