Today through Monday you can watch Cinemax for free if you're a DirecTV or Dish subscriber.
Thanks to FreePreview TV for the details:
Free Preview of Cinemax Scheduled for DirecTV
Free Preview for:
Available to Subscribers of:
Free Preview Begins: August 17, 2012 (Friday)
Free Preview Ends: August 20, 2012 (Monday)
Cinemax Free Preview for Dish Network
Free Preview for:
Available to Subscribers of:
Free Preview Begins: August 17, 2012 (Friday)
Free Preview Ends: August 20, 2012 (Monday)