I have wanted to share my calendar between myself and my wife. There have been lots of hacks, but today, with the announce of the mature Mozilla Sunbird 0.2.
I thought I would give it a shot, and downloaded / installed it. Very easy.
Then, I setup a place on WebDAV to host the calendar, and was able to point both Mozilla Sunbird and iCal.
It all went swimmingly well, and the end result is that I will know what Emily is up to, and she will unfortunately know what I am doing (well, what I put on the calendar ;)