Trumba - Online calendar that keeps you connected - Trumba OneCalendar

I've been using this to keep our family calendar, so far it's been working out quite well. I really like the fact that they have an Outlook add-in that you can use to sync the online service with, and they generate an RSS feed for calendars that you chose to publish.

Link: Trumba - Online calendar that keeps you connected - Trumba OneCalendar.

Trumba OneCalendar™ is an all-in-one service that allows you to publish a Web calendar, email upcoming events to groups, share schedules with family & friends, and easily manage your life all in one place.