Calendars

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30 Boxes
30 Boxes is a calender made for the web. Of course it offers all the basic calendar functionality, but it also integrates with many other services. Get content from your blog, instant messaging and you can show your friends what you are doing on your facebook profile page.
Cozi
A free family calendar, shopping list, and messaging service that can help keep busy families in sync.
Google Calendar
Internet calendar that lets you keep track of your own events and share your calendars with others. It's the ideal tool for managing personal and professional schedules. It is both simple to use and very powerful.