Plink! A multiplayer music experience by DinahMoe. Like ToneMatrix, but with friends (or complete Internet strangers!).
posted by spitefulcrow on Oct 9, 2011 - 16 comments

FastKat, for Friday fun HTML5/CSS/canvas game. Dodge the round dots in you modern browser. (Has no cats that I've found.)
posted by skynxnex on Aug 12, 2011 - 17 comments

Canvas Rider is an addictive game where you ride a bike on thousands of tracks drawn by other players. It's written only in JavaScript & HTML5, using the most of the new <canvas> element.
posted by sveskemus on Oct 11, 2010 - 37 comments

It's Flash Friday HTML 5 Wednesday! A variant of Asteroids has been unleashed on the web, as proof of the canvas element's abilities within the updated markup language; however, the color palette is opposite of the arcade game's original scheme, hyperdrive and shields are absent, as is audio, since in hypertext, additional lines of code are necessary for anyone to hear you scream. [via]
posted by Smart Dalek on May 19, 2010 - 34 comments