To get Drupal 7 quick and easily installed on top of Mac OS X 10.8 Mountain Lion for development or just to learn the software, this guide is intended for those who just want to get the CMS system without worrying too much about Apache, MySQL and PHP or launching the Terminal.
This contains all you need to get you going - Drupal 7.22, WebServer (Apache) and Database (MySQL)
Download The Software
Get latest bundled installer here Drupal 7.22 version this will download the compressed zip to your download folder, decompress and leave the installer 'bitnami-drupal-7.22-0-osx-x86-installer'.
Mountain Lion has extra security installed by default on installing non-Apple and non-App Store Applications, if you get the error above on the installation you need to adjust a System Preference. (OS X 10.7 Lion does not have this issue).
System Preferences > General > Allow Applications Downloaded from: Anywhere (as below) - or just control-click 'Open' the file with contextual menu.
Run the installer
Make sure both packages are checked
Leave the default location in the Applications folder to easily find
Set a login and password - this will set username and password for Drupal admin account (default is 'user') but only password for phpMyAdmin (the username is root)
Leave any port numbers as the suggested ones
Name the Drupal Site what you want
Install the files
Launch the Drupal application
After you launch the application your browser will launch and you will be brought to the local Bitnami home location
The default home URL is http://127.0.0.1:8080 (or your computer name in the bonjour format with a .local) Click on the Drupal icon to go to Drupal.
The default home for your Drupal site is http://127.0.0.1:8080/drupal
The user is 'user' and the password is what you set earlier.
That's It! Login and learn Drupal.
The default home for your phpMyAdmin is http://127.0.0.1:8080/phpmyadmin - the user is 'root' and the password is what you set earlier.
You don't need to go here unless you want to.
On login to phpmyadmin you have access to the backend MySQL databases
All the files and software needed to make the installation are all filed in /Applications/drupal-7.22-0 with the most important being 'manager-osx' if something isn't working check here to see if your websharing and database tools are running, which are Apache and MySQL - start the servers if required.
Run the /Applications/drupal-7.22-0/uninstall application
The Drupal/Bitnami Stack uses port 8080 for websharing - if you are already using that port you are prompted for an alternative port number as it won't be able to bind to the default port, this also applies to SSL which uses 8443 and MySQL which uses port 3306.
If you want to install Drupal manually on a workstation that already has an AMP stack try this method.