Your options for calendaring in the Enterprise just ballooned.
After many months of testing, Google Calendar finally adds CalDAV support. “CalDAV is an open protocol that allows calendar access via WebDAV. CalDAV models calendar events as HTTP resources in iCalendar format, and models calendars containing events as WebDAV collections. This allows you to publish and subscribe to calendars, share them collaboratively, sync between multiple users and sync between multiple devices.”
For now, the only application supported by Google Calendar is Apple’s iCal. “With CalDAV support in Google Calendar, you’ll be able to view and edit your Google Calendar events directly in iCal. Any changes you make in iCal will automatically appear in Google Calendar the next time you sign in (and vice versa). If you use iCal while offline, changes you make will be saved and updated in Google Calendar when you get back online.”