I stumbled upon this while reading my RSS feeds today and I think it is a great idea.
The site is RSSCalendar, not sure if it sort of coincides with the release of Google’s calender effort but it seems ironic. Basically from what I can gather registered users create a calendar then create entries that are updated to others via RSS. It does this by you creating a unique RSS feed to the calendar that you set up when you create a calendar.
I think this is a great idea as a way of sharing what you are doing with family or friends. The other application would be working with a small group on a business project for a limited time, as calendar’s can be daily, weekly, monthly or yearly. Updates will be sent to everybody subscribed to the feed in real time.
The only thing that I was thinking might be a concern is the fact that anyone would know what you were up to if they were subscribed to your feed. I am not sure if the option to password protect the feed is available but if it isn’t it should be. Because I am thinking if you post that you are out of the country on a certain week, I wonder if all your electrical appliances will still be there when you get home? In addition a group might not want the whole world to know what they are working on. I don’t know how easy it is to search for RSS feeds but I would not imagine it to be too hard. So the assumption that others would not know the feed address because you didn’t give it out is not in my opinion safe-guard enough.
Apart from that it looks like it has promise. Have a look. It is still in Beta but then again what isn’t these days.