JavaScript countdown (or up) script with split-flap flip effect. Used it in a recent project and works like a charm. Only downside is that it’s px based, but that can be overcome. Be sure to also click that “Developer API” link on the site, as the main page itself does not hold all needed information to tweaking it.
Related: Two years ago a few students of mine experimented with actual splitflaps. You can see the result here.