These CSS3 buttons - called BonBon Buttons - are impressive to say the very least. Make sure you're using the latest browsing technology to get the full impact. They aren't production ready yet but it's pretty incredible to see the potential of the future of the web when it comes to markup. Anyone looking to realize the full potential of HTML5 should spend some time reading through this article on Custom Data Attributes - a fantastic way to supplement javascript behavior through inline markup. The potential here is pretty huge.