The Mercury MESSENGER (Mercury Surface, Space ENvironment, GEochemistry, and Ranging) satellite took some spectacular pictures through the rear view window on the way to Mercury. On the Johns Hopkins University Applied Physics Laboratory site:
The Mercury-bound MESSENGER spacecraft captured several stunning images of Earth during a gravity assist swingby of its home planet on Aug. 2, 2005. Several hundred images, taken with the wide-angle camera in MESSENGER‰s Mercury Dual Imaging System (MDIS), were sequenced into a movie documenting the view from MESSENGER as it departed Earth.
Check out the movies here [Updated link, Ed.]