Mac OS X only: AppleScripter John Maisey offers an iCal utility that deletes duplicate events in iCal calendars. If one too many sync operations left your calendars with multiple instances of the same event, the Delete iCal Duplicates script will clean those up for you. Now available for both Tiger and Leopard, the Delete iCal Duplicates script is a free download for Mac only, donations appreciated.
De-duplicate iCal Events
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