So, I found http://passphra.se but wanted something a little more fawk.eu-style, so I’ve created http://xkcdpw.tlyk.eu (or http://tlyk.eu:1337 if you prefer). It’s the javascript code from here, wrapped in Node.js and the webserver that comes with it.

Code on github. All credit to Jeff Preshing, who wrote the actual thing. Someone’s even wrapped it into an NPM module so you can include it in your own projects, like the cool kids.