Tidbits
Introducing WebAPI
YUI updated and cleaned up its website. There’s a little discussion happening at Hacker News as well, with a lot of interaction with the YUI developers.
Behavior Attachment
Avoiding The Quirks: Lessons From A JavaScript Code Review – Addy Osmani gives a series of quick tips for writing your JavaScript
The Backbone.js Todo List Refactored – [...]

Libraries and Frameworks
Sprite3D.js
Responsive-Menu is a jQuery plugin to display menus as a select dropdown on mobile devices
jQuery Boilerplate is a boilerplate for creating jQuery plugins.
vintageJS
wru is a unit test framework for node.js and Rhino
box2dweb is a port of Box2DFlash 2.1a to JavaScript.
MediaElement.js
klass.js
JSONDB is a tiny script to pack and unpack (flatten and unflatten) JSON for [...]

Libraries and frameworks
png.js (by Devon Govett) is a png decoder in JavaScript using Canvas (also see bmp.js, which he released around the same time, but understandably got less attention)
pouchDB (by Mikeal Rogers) is a JavaScript implementation of CouchDB. Check out ReadWriteWeb’s writeup
Sprite3D: simple controls on top of CSS transitions and transforms
yal.js is a micro [...]

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Tidbits
Mozilla’s David Mandelin has started a weekly newsletter of JS engine updates
browserify lets you run node-like require() statements on the client side (in the browser)
Candy is a multi-user chat client built for Jabber
Octopress is written in Ruby, not JavaScript, but it’s worth a look. It simplifies getting jekyll set up, [...]