The 2-hour extended pilot of the new TV series Caprica takes place 58 years before the events seen in Battlestar Galactica. It "tells the story of how Colonial humanity first created the robotic Cybernetic Lifeform Nodes or Cylons, who would later plot to destroy human civilization in retaliation for their enslavement". I watched the 2-hour extended pilot and it was awesome; I'm really looking forward to the series (which airs in 2010). You can check out the promo video here.