Time is a healer when it comes to the illness that is writer's block. A good day or two away from whatever you may be writing at the time always helps. Sometimes I will listen to a CD that may reflect the mood of my writing because it will get you emotionally connected to the feelings of characters in your story. So if I were writing a story about a woman who was hell bent on revenge because the love of her life has cheated on her, I may pop in a Taylor Swift album :P Sleeping is another biggie -- because what dreams may come... If you're so into your story and feel blocked, laying down thinking of the story then usually my dreams will be about the story and will kind of lead me to the next writing session. I like to use my unconscious mind to help guise me sometimes.