I’ve been working with Drupal recently and one of the things that it has that I wish WordPress had an equivalent to is Drush.  Drush is:

Drush is a command line shell and scripting interface for Drupal, a veritable Swiss Army knife designed to make life easier for those of us who spend some of our working hours hacking away at the command prompt. From: http://drupal.org/project/drush

One of the great features of this tool is that it can be used to create scripted installs of Drupal, complete with any defaults you want including modules, themes and even content.  This allows repeated new installs of exactly the same configuration, which is what happens when I build new client sites.  The core set-up is almost always the same as most websites need a fairly common set of features.