History.js : History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for dat...
320 and up : ‘320 and Up’ is a lightweight, easy to use and content first responsive web design boilerplate.
MediaElement.js : HTML5 and made easy.
One file. Any browser. Same UI.
Streeme : Streeme can serve music to most HTML5 compliant browsers and smartphone handsets using the computer you already own.
A game in the address bar using html5 history.replaceState
