I've just set up an old machine I had sitting around as a bit of a network backup/storage and media server. Are there any useful free monitoring tools or other useful things I should have? So far I've got MBM5 alerting me to any PSU, fan or temperature related issues and a HDD S.M.A.R.T. program to alert me to any potential problems with the hard drives. And then the usual ZoneAlarm, AVG and Ad-Aware for added security. Any other "must haves" ?