(4)A set of high-resolution images from Hubble featuring galaxies colliding was just released by NASA to mark the space telescope's 18th birthday. Check out a gallery of photos here(1).
Appearing briefly at the start of the show, astronomer Phil Plait(2) commented on the new Hubble photos. For more, see his blog entry(3).

1. http://www.wired.com/science/space/multimedia/2008/04/gallery_hubble?slide=1&slideView=8
2. http://www.badastronomy.com
3. http://www.badastronomy.com/bablog/2008/04/24/when-galaxies-collide/
4. http://www.wired.com/science/space/multimedia/2008/04/gallery_hubble?slide=1&slideView=8