In the past I have gotten MacWorld and MacUser (for years), MacHome, and MacAddict. I still occasionally pick one up on the newsstand but honestly the news in them seems so old by the time they are published that they're just not as interesting or useful as they used to be. This has a lot to do with the whole rumor and speculation aspect being taken away by the internet with sites such as this, plus the "interaction" that the magazines never had. Also, there's been an explosion in Mac books in recent times. Five years ago the Mac section of our local Borders was probably a foot and a half long, now it has to be almost ten times as large.
It takes several months for anything to get into a printed magazine, so here it is almost march and I'm just now seeing "first impressions" of the stuff introduced at MacWorld Expo the second week of January. Well, online you can read much more timely reviews from users who have actually bought/played with/ripped apart and reassembled/tested the devices themselves, the magazines no longer have the "We got ahold of one first, let us tell you about it" angle to play on. Furthermore, I can find something specific I need much easier either online or in the bookstore than I can if I wait for one of the magazines to do a "feature" on it. If I want to know about AppleScript, I'm not going to wait for an article about it, I want to know now, so I go to the book store and look through one of the seven AppleScript books, or go to Apple's dev site. There's are lots of books that will teach you every "tip and trick" available for the Mac (plus websites like Mac OS X Hints), that I don't need to wait for some MacWorld writer to find a few and trickle them out each month, I can get them all at once, and probably more in-depth.
I'm not saying the Mac mags are useless now, but I don't get the same enjoyment reading them that I once did, and find myself quickly leafing through most of them now instead of reading every page like I used to. I have not found it worth it to subscribe to any in recent times.