I know there are thousand of visual effects made in JS that can be found on Google. But most of that effects are useless in web-design, or are outdated like "clock following mouse cursor" :| Also I know sites like http://www.chromeexperiments.com and http://www.dhteumeuleu.com but those examples make web-browser uses 100% CPU power and mostly looks good only as an example.
What I'm looking for is effects that looks nearly impossible to achieve without Flash, that not use 100% CPU, and doesn't disturb user. I need it for game web-page. One of very good examples is this one: http://jqueryfordesigners.com/demo/trovster.html - look carefully at header.