chkconfig is a better way
You can use "chkconfig" to enable/disable services to that the computer does not even try to start them. With "chmod -x" it will still try to start them but fail, which could result in uncessary system log entries. Some examples:
"chkconfig --list" - list all of the services and what runtime level(s) they are enabled in
"chkconfig <service name> off" - disable the service in all runtime levels.