History.js : History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for dat...
Web Forms : Web Forms 2.0 Cross-Browser Implementation
Flowplayer : Flowplayer is a beautiful and minimalistic, yet full-featured HTML5 video player that lets your video be the star of the show. Supports all devices.
Undum : A client side framework for hypertext interactive fiction games
A game in the address bar using html5 history.replaceState
