How to get Drupal's clean URLs working on OS X

To get Drupal's clean URLs to work on OS X, it's not enough to just turn on the AllowOverride All directive in /etc/httpd/httpd.conf, you must also turn it on for your user account by editing your own username.conf file.

Edit the file in pico (replace username with your own name):

sudo pico /etc/httpd/users/username.conf

And change it to:

<Directory "/Users/username/Sites/">
    Options Indexes FollowSymLinks
    AllowOverride All
    Order allow,deny
    Allow from all
</Directory>

Restart apache and Drupal's clean URL's should be working.