Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I have 10. But I've given up on iCal once again and gone back to Entourage. iCal 1.5 is a lot better than the first release, giving options to sort to-do items, etc. but it still has lots of bugs. Changing the calendar on an item can cause it to crash. Syncing thru .mac creates duplicates. No way to easily purge all old events. Worst: Doesn't handle time zones - if different computers are in different timezones, the events move up and down.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.