There are some amazing photographs presented here in this list of the top 10 astronomy images of 2006:
The Top Ten Astronomy Images of 2006 : http://www.badastronomy.com/bablog/2006/12/27/the-top-ten-astronomy-images-of-2006/
My personal favorite is number 5.
Updated 2021 : note that the above post is out-of-date, given this post was originally published in 2006, but is left here for archival purposes. I have unlinked the external website as it is now dead.