Waning crescent is the term for when the moon is more than 22 days old.  Darkness is approaching the western limb of the moon.  Its really hard to get a good photo of the waning crescent because it rises just a couple of hours before the sun.  It was almost 4 AM when I got this shot and the sky was getting bright.  This can make the photo have poor contrast. 

Image:  August 08, 2007