The 30 boxes online calendar tool is simple, yet has enough features to make it worthwhile. Participants can collaborate on adding to the events on the calendar. Events can even be generated automatically from RSS feeds. You can use the drag and drop functionality to move events around the calendar. I could see great value in this tool as a simple online family calendar, a teacher's calendar of due dates, or a calendar for after school groups. I know for our school musical, there are dates for different groups to rehearse, days for the crew to meet, and of course all of the full cast rehearsals and shows.
While playing around, I found at least two added features that I really liked. One is the built in task list. You never can have enough 'Things to do' lists floating around. And finally, and maybe the best feature...When you register, you enter your zipcode. 30Boxes automatically includes and updates the 5 day forecast.
I am not sure if it includes all of the functionality of something like the Google Calendar, which my family uses. We especially like the Google Calendar as it allows you to color code and superimpose a number of calendars on the master calendar. We can see our whole family's ridiculously busy schedule all in one place :)
Try them both out. I am interested in hearing your comments.