As part of their Thor movie promotion, Dr. Pepper and Marvel are offering a one month free digital comics subscription!
I am always skeptical of these things, but you do not have to submit any credit card info beforehand, so you don't have to 'enroll and cancel' like many 'freebies.' Although it is an option if you choose to get a second month for only a dollar. But I'm a cheapskate and notoriously absent-minded, so I only opted in for the one month free!
You don't even need to buy a Dr. Pepper - just go to http://www.drpepper.com/promotions/thor/ and sign up!