Steps to take Drupal site out of multi-site install

sites.php

<?php
$sites = array(
  'sitename.com' => 'sitename.com',
  // the first sitename.com in the file, refers to the url content in the browser's window,
  //you may/probably should replace this with a FQDN.
  // the second sitename.com appearing after '=>' is the directory name inside sites/ where
  //the site files are stored.
);

steps.sh

# SSH into development server, cd into Drupal platform install directory and do:
$ drush ard sitename.com --destination=~/site-backup-filename.tar.gz

# Move site-backup-filename.tar.gz into the production server

# SSH into production server, cd into Apache document root and issue:
$ drush arr site-backup-filename.tar.gz --db-url=mysql://dbuser:dbuserpasswd@dbhost/dbname

# This will restore the sitename.com directory inside a full Drupal install taken from
# the development server's platform, e.g. drupal-7.10-x

# Change owner for the whole Drupal directory:
$ chown -R www-data:www-data drupal-7.10-x

# Just in case, also issue the same command for the following directories:
$ chown -R www-data:www-data sites/sitename.com/files
$ chown -R www-data:www-data sites/sitename.com/private
$ chown -R www-data:www-data sites/sitename.com/private/temp

# Create sites/sites.php file with the content from sites.php in this gist:
$ touch sites/sites.php

# Or you can just symlink sites/sitename.com to sites/default to emulate a clean Drupal install:
$ ln -s sites/sitename.com sites/default

# Just to be completely sure, remove anything from sites/sitename.com/settings.php
# that is not db related, when the site is restored, drush appends the new db settings
# to this file, so pretty much what's before this new db declaration is "useless".

# Issue several times:
$ drush cc all

# just to be sure we cleared all cache from this new install...
# remember to do this inside sites/sitename.com directory.

# in case you forgot to check permission (specially in CentOS and Enterprise built servers)
# remember to issue inside the Drupal install directory:
$ find . -type d -exec chmod 755 {} \; 
$ find . -type f -exec chmod 644 {} \;
$ chown -R [apache/nobody]:[apache/nobody] .