A Search Engine Watch forums thread points to the new Google Calendar which has an emphasis on the user experience and allows for sharing and integrating other calendars into your own.
I took a few screenshots of the Google Calendar, and Google Blogoscoped and the Google Blog have more.
A number of public calendars can now be added to your personal calendar, such as this Netflix one in particular which shows when new DVD releases have come out.
This is what it looks like when I integrate this public calendar into my personal calendar.
Additional coverage continues on Techmeme, and Google has a FAQ for the gallery in the Google Help Center.
Forum discussion at Search Engine Watch Forums.