From Slashdot:
slummy writes " JS/UIX 'is an UNIX-like OS for standard web-browsers, written entirely in JavaScript (no plug-ins used). It comprises a virtual machine, shell, virtual file-system, process-management, and brings its own terminal with screen- and keyboard-mapping.' If only you didn't need an OS to run the web browser on."

Would this be useful on the PSP since it would run from the browser?

(It would seem that the site has been "slashdotted", it will probably be accessable in a few hours)