OI Calendar Picker.
Download available soon.
OpenIntents Calendar Picker is a utility to pick dates and events and visualize timeline-based information.
The calendar picker lets you select a date or a specific event. Press the menu button to view a list of all events.

If you tap on a date with one or more events, the event list is displayed. Select an event to pick it.

Fling horizontally or vertically to scroll through the months. Alternatively, you can drag the marker on the timeline to select a month.

The sample application CalendarPickerDemo shows how to call OI Calendar Picker from your application.

Details can be found at CalendarPickerAPI.
(not yet released)