GoCalendar
This extension displays the the next appointment on your calendar.
Clicking on the arrows will cycle through the entries.
Features :
Appointment cycle: Clicking on the toolstrip will cycle between calendar entries.
Login Request: When needed, clicking on the Toolstrip will open a new tab on Google Calendar Login page.
Download:
http://gocalendar.googlecode.com/files/gocalendar-0.3.1.crx
Homepage:
http://gocalendar.googlecode.com