This is almost not worthy of calling my own. The idea is from Jonas Björk, who made the original script.

Download Drupal Modules is a small python script that helps the user to download the thousands of drupal modules that’s publically available on drupal.org.

With a simple interface it allows you to easily search, filter and download the modules that  you are looking for.

The most simple command goes: ./idm.py [module name]

Take a look at ./idm.py –help for more information on how to use this tool.

Usage: idm.py [options]

Options:
 -h, --help            show this help message and exit
 -f version, --filter=version
 Filter the results in version numbers.
 -d, --dev             Show developer packages
 -v, --verbose         Verbose mode (Default on)
 -q, --quiet           Turn off output

Download it here: http://marcusfollrud.net/wp-content/idm-mf.py
Or with git (hosted on github): git clone git://github.com/marcusfollrud/idm.git