Some Ical all-day events automatically move to Jan 1 2000 (01/01/2000)

I have the exact same problem. I have entered birthdays for people I know starting with the year of their birth and never ending, an all-day event. They now don't show in 2007, but there is a detached event on January 1, 2000. When I delete that event and all subsequent versions of it, the initial event now ends in 2006 or 2007, and I have to set the repeat to end Never again. I fixed all the ones from February that showed up. Now I notice that a huge amount of the other birthdays (all day events) that I have entered are doing it now, and we are talking well over 40 of them. I don't understand why it keeps creating these detached events. I also publish my calendars, if that makes any difference.

I do the same thing! I sync to my Razr. I'll have to backup my calendar then sync and see if it happens again. I am glad you observed that.

UPDATE: I noticed an error in my iSync log that states: "• Changing events in a read only calendar on the phone is not allowed. These changes have been ignored: " followed by a list of events. I realized that I was trying to sync a calendar i subscribed to on another machine, which would be read-only. So I removed that calendar from the selections, quit iSync and started it again and the last sync didn't seem to mess up my iCal.