So iCloud is set up on my Mac running Lion. I also set it up on my iPhone 4; I have yet to set it up on my iPad 2, since I don't want to upgrade to iOS 5 and lose my jailbreak. The problem I had was that when I synced everything up, I ended up with duplicate events in my calendar: the events shown from my "on my mac" calendar, and the same events displayed again from my "iCloud" calendar. It became confusing, so I did a little bit of "housekeeping" and decided to change the setting on iCal to delete events older than 30 days. Then I tried to delete all of the events from the "on my mac" calendar, since I assume I only need to have the ones in iCloud now since they're the same events. I suppose this distinction of "on my mac" calendars and the "iCloud" calendars help those who don't want their calendars to mirror each other, but I do so I assume I'm doing it correctly. There is one recurring event which I can't delete however. I've deleted all of my recurring events, but one of them seems to just stay there no matter what I do. I also am not sure what my "Gmail to do" calendar is or how to remove it.