yes.. you want to run ntpd, instead of running ntpdate on a cron. I've been told that it's best to setup ntpd with around 6 good sources to maintain a good solid clock sync.. ntpd will drift your system clock dynamicaly to adjust for inacuracies in most PC's poor clock chips. This will keep everything in sync.. I use this on many servers.. it's great.
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80gig red mk2 -- 080000125
(No, I don't actually hate Alan Cox)