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Syncing OmniFocus on a desktop with OmniFocus on an iPhone/iPod Touch has nothing to do with syncing to iCal. Syncing between versions of OmniFocus *does* happen automatically -- once an hour, plus a couple minutes after any change occurs.

iCal syncing is provided primarily as a way of syncing with non-Apple devices that sync with iCal. I can't find it at the moment, but Brian explained why it's not automatic in another thread....