After the Leopard 10.5.2 release, I've given up on iCal. It has screwed me over for the last time. I've been using Sunbird (from Mozilla) as an alternative for the last couple of days, and it seems to be working pretty well. The Mozilla project has two calendar projects going: Lightning which is designed to integrate to Thunderbird if you use it for mail, and Sunbird which is a stand-alone calendar. I was able to export all of my iCal events into Sunbird with no issues. Maybe someday iCal will be worth using again.

Although I'm switching on a Mac, the Sunbird and Lightning projects work also on Windows and *nix platforms too.