Moya:provision adrian$ cat ~/.drush/aliases/server_localhost.alias.drushrc.php
<?php
$options['aegir_root'] = '/Users/adrian/Projects/hosting';

$options['db_service_type'] = 'mysql';
$options['db_service_user'] = 'root';
$options['db_service_pass'] = 'pass';

$options['http_service_type'] = 'apache';
$options['http_service_group'] = 'nogroup';
$options['http_service_restart_cmd'] = 'sudo /Applications/MAMP/bin/apache2/bin/apachectl graceful';

Moya:provision adrian$ cat ~/.drush/aliases/platform_DRUPAL6.alias.drushrc.php
<?php
$options['web_server'] = '@server_localhost';
$options['root'] = '/Users/adrian/Projects/hosting/platforms/DRUPAL-6';

Moya:provision adrian$ cat ~/.drush/aliases/newtest2.alias.drushrc.php
<?php
$options['platform'] = '@platform_DRUPAL6';
$options['db_server'] = '@server_localhost';
$options['name'] = '@newtest2';
$options['uri'] = 'newtest2.dev';