This sounds a little similar to an issue I had with my Hero soon after I had first got it.
During some playing around with the phone and comparing it with what was available (apps) on my wife's iPhone 2G, I downloaded & installed a NightClock app from the Market.
After this, the Hero's alarms failed to work at all, despite setting them properly. I uninstalled the NightClock app & this failed to resolve the issue. The only way I could get round it was to do a factory reset of the phone.
So I would be interested to see if you have installed any time or clock apps onto your phone, as it seemed to me that they can cause conflicts with the generic clock/alarm functionality in the Hero.
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