The above photo is an ultra-high resolution aerial image of ground zero that was taken by NOAA on September 23, 2001.

The detail in a full-resolution slice of the image is astounding:

You can download the full, 14 MB file at this link. A smaller, more browser friendly version is here.

Compare the 2001 photo to the progress made at the site as of April of 2006. (After the BREAK)

This photo was taken by a Space Imaging satellite:

After five years, the site doesn't look all that different, does it?