The first photo of earth, as a planetary disc, were posted yesterday here:
http://www.msss.com/mars_images/moc/2003/05/22/
This was something I found to be very deeply moving. To see the earth, not as a point of light or as a shining sphere, but as a murky bluish pebble, gave me a lonely, melancholy feeling. Especially when shown in the same jpg as Jupiter. No songs or sermons, I think, can do this image justice.