I've just released a new javascript matrix library for use with WebGL called glMatrix. Though it wasn't an initial goal of the library, when all was said and done it appears to be the fastest matrix library available. (Though I would love for someone to prove me wrong on that!)

As a first release I fully expect a random bug or two to crop up, but I'm committed to squashing them as quickly as possible. Outside of that, though, I would love any feedback on ways that this library could be improved! Please take a moment and check it out!

glMatrix on Google Code
Introductory blog post
Live Benchmark (It takes a moment to run, be patient...)