How about
https://www.google.com/calendar so that you can take it with you where ever you log in ?
Plus you can sync it with
Sync With Microsoft Outlook
Google Calendar Sync: Overview
Google Calendar Sync: Troubleshooting
Sync With Mobile Devices
Google Sync for BlackBerry: Overview
Google Sync for BlackBerry: Troubleshooting
Sync With Apple iCal or Mozilla Sunbird
Google Calendar CalDAV support