I subscribe to:
Cargo - so-called "buyer's guide" that occasionally has interesting products but is increasingly nauseating me with each issue. Too much consumerism, coupled with a lack of real content (articles amount to little more than extended advertisements and showy exhibitions), has led me to consider cancelling my subscription.
Popular Science - I've taken this regularly since 1995, so I guess it's an old standby. It still provides a mostly interesting mixture of tech and science articles, sometimes with less scholarly writing than I would like.
Scientific American - extremely well-written, insightful, thought-provoking articles on all manner of science-related topics, including many that you won't see outside of scientific journals. This is pretty heavy reading, but they have a very formidable staff of writers and guest editors.
Cinefex - quarterly review of visual effects in film, covering 3-4 major releases each issue. This subject is an interest of mine, and the content here is far more in-depth than you will find on the average DVD extra. The staff has seemingly unlimited access to very famous and influential people in the industry (think John Gaeta, John Dysktra, everyone at ILM, etc.), and the magazine has built up a strong reputation in its 25 years of publication. This is really the only magazine of its kind, and it is primarily aimed at those in industry who want to read about what's going on in vfx houses other than their own; as such, there isn't any consumer advertising in its pages, only spots for rendering packages, For Your Consideration messages, etc.
Wired - pretty much the best tech magazine out there. I read all the tech news I can get, and Wired allows me to view things from a more analytical and philosophical perspective than I get from empirical coverage. Heavy hitters like Stanford CS professor Laurence Lessig are regular contributors, and the staff has high-level access to any and all major tech companies you can think of.
Maximum PC - mostly fluffy, but the hardware reviews are occasionally informative. I could do without the "kickass" labels and other rather pathetic attempts by the staff to appear "rebellious" and "tough." It serves its purpose, however.
Premiere - the most complete general coverage of the movie industry available, at least in my experience. Miles better than EW and People (though it's still relatively shallow reading); it tells me what I want to know, and amuses me sufficiently that I haven't bothered cancelling it. Their photography is unusually striking, I must say.
So there you have it. Any questions?