The only one I subscribe to right now is Harper's...the political mag, not the fashion mag Harper's Bazaar. I will typically go on this mag for a year when they offer me a good deal and then off it for a year or two when they want me to pay the going rate to continue. I used to also get Atlantic Monthly, but I never was able to even remotely keep up with the two mags after we had our daughter and AM never sends me good offers to re-up anymore.
My wife gets Consumer Reports and I will usually read that fairly closely.
Used to get a SKI magazine sub for free when I raced NASTAR, but reading those got old pretty fast. I will occasionally buy Ancient History and Ancient Warfare mags at the bookstore, but too many of the issues of those are duds as far as my interests go to think about subscribing.