Uninstall and remove all traces of mysql from OSX

First be sure the server is shut down (first line)

/Library/StartupItems/MySQLCOM/MySQLCOM stop
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*

edit /etc/hostconfig and remove the line MYSQLCOM=-YES-

sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*
rm -rf /var/db/receipts/com.mysql.mysql*