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Did the duplicates happen to be coincident with upgrading to iPhone OS 3.0? One of the changes in 3.0 is to allow independent syncing of iCal information via both MobileMe and iTunes. I enabled both kinds of syncing and got duplicates of all my contacts and calendar items. Once I sorted that out, I haven't had any duplicate items issues.

I don't use iCal ToDo items, so don't know if the same duplicate issue happens there. And my duplicates had nothing to do with OF.

Out of curiosity, why are you syncing To Do items to iCal if you have OF for iPhone? (I'm not trying to be critical, just wondering if there is some benefit that I'm missing out on.)