ICal mysteriously no longer syncs with my iPhone 3gs via iTunes sync

My iCal mysteriously no longer syncs with my iPhone 3gs via iTunes sync. It worked great until about a month ago. I've made over 300 Calendar changes to my iPhone 3gs' Calendar, but not a single item has synced back to my iCal on my iMac, when I sync my iTunes (which I do almost daily). In addition, I've created some items on my iCal, as a test, and none of them sync onto my iPhone 3gs.
What gives? Ideas? Suggestions?
Thanks for your help!

Well, I was able to manually sync my iPhone to my iCal one time, but haven't been able to get it to sync Calendar info since then. It was moderately successful, so I could export an iCal backup file. However, I ended up with about 200 MORE duplicate items on my iPhone, and what's weird is that many of these duplicates do NOT have any "edit" functionality! So I a, stuck with them being on the day they are at right now. Grrrrrr

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