Booting linux inside your browser

http://bellard.org/jslinux/

I'm impressed. It even features emacs and a working C compiler.

Technical notes: http://bellard.org/jslinux/tech.html

An x86 emulator in Javascript? That must be slow, but probably not as bad as Ruby as too many heavyweights have invested in fast Javascript despite its design not being too good for speed and the fact that eval is abused way too much in javascript code.