[3D gaming in-browser without plugins][link]. Playable TODAY with a [nightly build of Webkit][nightly] on your Mac. Wow.
[link]: http://blog.wolfire.com/2009/09/preview-of-webkits-webgl-canvas3d/ “Wolfire Blog – Preview of WebKit’s WebGL / Canvas 3D”
[nightly]: http://nightly.webkit.org/ “Nightly Webkit builds”