Web-based Calendars
30 Boxes - "30 Boxes was created for people looking for a robust yet simple social calendar that is easy to share with family and friends." (74 visits)
http://www.30boxes.com/
Google Calendar - "Wouldn't it be great to be able to keep track of all the events in your life, coordinate schedules with friends and family, and find new things to do -- all with one online calendar? We thought so, too." (66 visits)
http://calendar.google.com/
Kiko - "Kiko brings you a great, dead simple calendar you can use right in your web browser." (65 visits)
http://www.kiko.com/
Spongecell - "A free and easy to use calendar for you and your friends. Available when and where you need it." (82 visits)
http://spongecell.com/
Trumba - website calendars (72 visits)
http://www.trumba.com/
WebCalendar - a PHP-based calendar application (70 visits)
http://www.k5n.us/webcalendar.php
Yahoo! Calendar - "Access dates and meetings from anywhere, anytime. Share your calendar with specific friends and co-workers. Remember important dates, set up automatic reminders." (70 visits)
http://calendar.yahoo.com/