Have you heard about AdPerk? They have a great system for earning free subscriptions to magazines. You simply select the magazine that you are interested in, watch a few advertising videos, and you earn credits toward a subscription. You do have to watch the video through to the end, because you need to enter a code to receive credit for it, but it only takes around 15-20 minutes to earn some great free subscriptions.
Right now they have available: Ode, Popular Science, Good Housekeeping (one of my favs because of the coupon insert), Skiing, and Field & Stream. Also, if you’re in the Los Angeles area they’re currently offering a free pass to the Dwell on Design exhibition. I’m totally jealous, because I’d love to go to this.
I recommend adding this site to your favorites and checking back frequently, because they have a ton of subscriptions that will be available soon, including Alternative Medicine, Cosmopolitan, CosmoGirl, Country Living, Dwell, Esquire, Golf, Marie Claire, and Smart Money!