A countdown, days, hours, minutes.
You can either add it in the widgets screen, or you can use the shortcode:
[countdown date='January 1, 2014' title='New Year Countdown' message='Happy New Year' width='157']
Optionally you can specify a width.
The widget works by pulling in the actual full countdown web application from the ipadstopwatch.com site.
More specifically it pulls in an HTML file into an iframe.