Fabrice Bellard, the author of the open source, VMware-like QEMU emulator I use every day, has written a virtual PC that runs entirely in Javascript called JSLinux. Geeky? Yes. Practical? No, but give the man points for being a world-class hacker!
Fabrice Bellard has written a 32 bit x86 emulator in Javascript — in plain English, he’s created a virtual PC that runs inside your browser, using Javascript. And then of course, he created a GNU/Linux variant that can run inside it — so you can run a full-featured PC inside your browser.
via Javascript-based PC emulator, running GNU/Linux – Boing Boing.