If you have forgotten your MySQL root password, you can reset it if you have physical access to the machine mysql is running on:
kill `cat /usr/local/mysql-standard-4.0.16-apple-darwin6.6-powerpc/data/localhost.pid`
/usr/local/mysql-standard-4.0.16-apple-darwin6.6-powerpc/bin/mysqld_safe --skip-grant-tables &
/usr/local/mysql-standard-4.0.16-apple-darwin6.6-powerpc/bin/mysqladmin -u root flush-privileges password "newpassword"