First in a series of Mockup PSD files that I'll be putting up for download. Simply open the PSD file, double click the Smart Object for the cover and replace it with your file.
NOTE: The Esquire cover was (obviously) not done by me. It's for mockup purposes only. Kudos to the first person to post WHO actually did the cover :)
Next file will be a magazine cover with a simple grey/white floor.