I just installed mysql on a mac running 10.6. The mysql version is 5.1.56. I need to have mysql run on port 3307. This article says we can change the port by modifying this file
Looks like the new installers are adding the port as 3307
To change that follow below steps
sudo vi /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist change 3307 from this line --port=3307 to 3306