Have You experienced Google chrome ?
Chrome is a really cool very fast browser. Its javascript engine is very fast. It supports features from HTML 5. Notable one is the 'canvas'. Using canvas, it can create and act on elements replacing images. The js code can change its attributes which can create really cool animations with just only javascript which was once possible only with flash. If you have successfully installed chrome, check this site.. http://www.chromeexperiments.com/
This site consists of experiments with javascript which will require fast js engine like the one in chrome. It consists of variety of experiments which include games, animations, attractive frontend for popular sites like twitter etc., These experiments were created by designers and programmers from around the world using the latest open standards, including HTML5, Canvas, SVG, and more.
Here are my favourite ones
chain-reaction
ball-pool
twitterbrowse
berts-breakdown
For those who dont want to leave the traditional Internet Explorer, hereis a way to experience chrome inside IE
http://googlesystem.blogspot.com/2009/09/use-google-chrome-in-internet-explorer.html