So few days ago i was watching a google presentation about their new game development platform. At the end of the presentation they showed that is possible to make the game Angry Birds using just HTML5. No flash or other plugins are required. To play the game you will need a modern web browser. So forget Internet Explorer. I tested it and it fails on Internet Explorer 9 and 10 beta.
So visit http://chrome.angrybirds.com with Google Chrome or Firefox 4 and have fun!