Events doubling up on iPhone 3G when synced with iCal on my iMac

Hi all,
I'm having an annoying problem with iCal on my iPhone 3G...
I'm happily using iCal on my iMac and everything seems up to date, days and events look perfectly normal on there. However, when I sync it up with my iPhone 3G, for some reason some events (but not all) are being doubled up on my iPhone. They aren't there on my iMac's copy of iCal - that still looks correct.
I tried going through and deleting the extra events from my iPhone. As soon as I synced again with my iMac, all the rogue events reappeared on my iPhone. Tried it a few times, same result.
I have a feeling the rogue events that are appearing on my iPhone are ones that I originally inputted onto my iPhone's copy of iCal, then a few weeks later I've adjusted them, deleted them, generally tidied up my calendar through iCal on my iMac. This might be why it's only doing it to a few events I've added, not all of them. When I re-sync, it's like they keep being resurrected on my iPhone.
I've tried re-syncing using the Advanced option in iTunes where you replace information on the iPhone - the rogue events still came back on my iPhone. I also just tried going to my iSync preferences and resetting my Sync History. Didn't fix it.
I don't use MobileMe and I have no other computers or calendars so there's nothing else trying to sync up that might be generating these doubled up events. I'm not doing anything other than try and sync my iPhone 3G with my iMac through iTunes.
Any ideas where these extra events are coming from and how I can flush them out of my iPhone's copy of iCal?

I just posted this in another thread, but I'll summarize it here for you:
I had three groups of calendars in the Calendar app on my iPhone (OS 3.0): calendars from my MobileMe account, a set of calendars I had subscribed to with iCal, and calendars entitled "From My Mac" which was a duplicate of every calendar from the other two groups. What I wanted was to go back to having just the MobileMe syncing over the air, plus the subscribed calendars, so everything would be continuously updated instantly. I didn't need a duplicate set of static calendars, and so I wanted to get rid of the calendars in the group "From My Mac".
I made sure I'd unchecked the checkboxes for iCal in the Info tab of iTunes for my iPhone, and then applied the sync. Unfortunately, this did not remove that new special group of calendars for my iPhone, yet. I guess it kept them just in case. (Side note: Interestingly, when I recreated my problem to re-test this, I forgot to do this again. The checkbox for the Calendars seems to magically uncheck itself if I go through the rest of the steps without doing this first. I think iTunes gets informed from the cloud at some point, perhaps after I decide to delete the calendars in the "From My Mac" group from within the iPhone. So, you may not need to do this. Anyways, make sure it's unchecked so it won't happen again…)
On the iPhone, I opened the Settings app, went into "Mail, Contacts, Calendars", chose my MobileMe account, and then turned off the Calendars. It asked me whether I wanted to delete the MobileMe calendars from my iPhone and I chose "Delete from My iPhone". Note that the message explicitly refers to your iPhone and not MobileMe, so you are not deleting them from MobileMe. (But please do read the messages and don't assume that's what it says. There are many prompts.) If you don't delete them for your iPhone, they'll get added to the "From My Mac" group of calendars. This isn't a problem since this group will get deleted later, so you can choose either to keep them, or delete them now.
Wait a moment before turning the Calendars back on, to give it time to process the "offing". When turning the Calendars on, I was asked whether I wanted to merge the MobileMe calendars with the existing calendars on my iPhone, that special group I was trying to get rid of. I chose "Do not Merge" because I didn't want even more duplicates, I just wanted what I had in the cloud, on MobileMe.
After not merging the calendars, next it asked whether I wanted to keep the existing calendars I had on my iPhone. I chose to "Delete" them, which it then asked me to confirm (Delete or Cancel) so again I chose "Delete". (And once again, please read the messages carefully and don't assume what they say just because what is written here. The messages might change with updates.) When I opened the Calendars app on the iPhone, the "From My Mac" group of calendars was completely gone. I was back to what I had before, just two groups: the MobileMe calendars I had just turned on, and the subscribed calendars that I hadn't touched.
I think the key is to not merge with the duplicate set of calendars, and to not keep them. Otherwise, you can't go wrong because everything is on MobileMe, as long as you're synced with it.

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