4kg: Prototype is an HTML5 platformer game released to the Chrome Web Store — a marketplace where any amateur game developer can release games right next to moguls such as Angry Birds. The author, Andrew Rabon, answered some questions about its development.
An open-source project to emulate the GameBoy color can teach you about both hardware emulation and how to draw things quickly to the canvas element.
Cloudmach is peddling a hybrid client-side/server-side technology. While their site is mostly busy with hype, the angle is interesting: Use WebGL simply as an optimization.
The Wheels of Steel lets you scratch with two virtual turntables complete with pitch bending and an equalizer. It’s not completely HTML5 — there’s a little Flash — but the mix is impressive.
Playtomic now allows developers to support private leaderboards so that groups of friends can compete more closely.