iCloud has some exciting new features that will inevitably tempt you into upgrading. Perhaps you jumped out there and upgraded to iCloud without understanding what you were about to loose from Mobile Me. If you have upgraded to iCloud but still have a Snow Leopard system around you can still sync your iCal data.
To enable Snow Leopard syncing with iCloud simply add a new CalDAV account in iCal. Enter your iCloud username and password. Enter “p06-caldav.icloud.com” (without the quotes) as the server address. Hit the Create button and your back in business!
It’s just that simple; Hope it helps!