WHAT IS DRUSH MAKE?
"Drush make is an extension to drush that can
create a ready-to-use drupal site, pulling sources
from various locations. It does this by parsing a
flat text file (similar to a drupal `.info` file) and
downloading the sources it describes. In
practical terms, this means that it is possible to
distribute a complicated Drupal distribution as a
single text file."
http://cgit.drupalcode.org/drush_make/plain/README.txt?id=refs/heads/6.x-2.x