Some observations first:
When you are in Month View in Google Calendar and enter an event name in the pop-up, it will be created as a whole-day event.
OTOH, if you enter the event name like "19:15 Foo" or "14-16 bar", then Google Calendar will be smart enough to create the event with correct time (and remove the hours from the name itself). Cool - significantly removes the clicks needed to add something.
My question: What more can be done this way? Can I easily add an event with auto-repeat, for example? What else?