Sheriff Ann Mathis, the guest character in "Northwest Passage" (this week's episode of 'Fringe'), carried a pen with the inscription "Find The Crack."
It was a gift from her deputy, Bill Ferguson, and the phrase referred to his advice that she should look for the bright spot in even the darkest of scenarios.
The way the over-all storyline on 'Doctor Who' is playing out this season, could this have been a subconscious manifestation of a cosmic warning about the crack in Time? (Like the message of "Bad Wolf" that showed up throughout the 'Doctor Who' season with Christopher Eccleston as the 9th incarnation of the Doctor.)
Just sayin', is all.....