calendário online

[Mais um serviço. Não é inovador, o Yahoo já o tem há algum tempo.]

Google acts to organise your life
Google has launched its latest salvo against rivals such as Yahoo and Microsoft, unveiling a free online calendar service.
The web calendar lets people store appointments, receive reminders and share schedules with others. It is tied in to Google's e-mail service, Gmail, automatically offering to add the date information in a message to the calendar.
Google Calendar
Yahoo Calendar
Upcoming.org