The Google Calendar Welcome Page
now notes that Safari is an offically supported browser.
It loads without any problems and all the drag ‘n’ drop and other slick features seem to work fine.
One thing I did notice: clashing events are rendered less clearly in Safari, where they lack the immediate visual clue of an overlap:

[Via TUAW
]

Their ‘welcome to Google Calendar’ page now lists Safari 2.0.3 as officially supported:
http://www.google.com/googlecalendar/overview.html
Forgot to link that in my post. Oops.
Thanks for that. I didn’t think to look there.