A map of comet Tempel 1 shows the areas not imaged in 2005 by Deep Impact in bright blue. The yellow area was expected to be seen during the Stardust flyby on February 14/15, 2011. The red bull's eye indicates the location of the Deep Impact mission's impact crater.
Here's another way of looking at the expected views:
NASA / JPL / UMD
Expected views of Tempel 1’s nucleus during Stardust flyby
A shape model of Tempel 1 shows that only half of it was seen in sunlight by Deep Impact; the blue areas have never been imaged. On approach, Stardust hopes to have the Deep Impact crater at the center of its view (top right); on departure, Stardust should see territory that has not been imaged before (lower left).