Pamala Oslie really talked about the implications of a parallel_universe. Its a common plot theme in several movies and TV series that's occasionally referred to as an alternate_timeline.
"The film ends eight years in the future with Evan leaving an office building in Manhattan and passing Kayleigh on a crowded daytime sidewalk. They alternately pause and turn after spotting and passing each other. While Kayleigh seems to have only a vague intimation of having seen him somewhere before, Evan remembers her very well and after hesitating, allows the moment to pass and lets her walk away from him without saying anything." http://en.wikipedia.org/wiki/The_Butterfly_Effect#Plot
1998: 7 Days had an interesting premise in that was about time travel into the very recent past.
{"The email explains that the Source Code effectively allows the user to change history within alternate timelines. Stevens' email ends with him telling Goodwin that when his alternate self in this timeline (comatose and on life support) is used in a future Source_Code mission, Goodwin should help him and tell him that "everything is going to be OK."}
Lori-Toye has seen some possible future scenarios.
