FAGicon is Tetris in your favicon, by some weird Russian dudes. How does it work? I don't know, but it does. Try the link on HackerNews.
eccube is a very trippy Processing.js game which interacts with music (via the Echo Nest API), from the good folks at Bloom.
WeatherChecker adds weather to your Google Calendar. Did you know WUnderground has an API? More weather mashups are afoot; I can feel it in my little toe.
Germanita was the only hardware project at Disrupt, by yours truly and co-hacker Erik Swedberg. It implements the DMX protocol with an Arduino to drive lighting from a web application, based on music analysis from Echo Nest.
(It turns out we were following in the footsteps of local design personality Ben Cerveny, who developed a project called UrbaNode with some folks in Amsterdam to drive DMX from JavaScript. Great minds think alike!)
BridgeWater Disrupt was not in the Hackathon, but nonetheless a very cool project by two guys from the Bridgewater Associates hedge fund. Not only is it a virtual market for trading "shares" of presenting startups, but it offers an API for writing automated trading agents.
nwm is a tiling window manager based on dwm, written (and scriptable) in JavaScript. Why use any other language? Also not officially presented as a Hackathon hack, but a great hack.
There's a writeup about hackathons in yesterday's Wall Street Journal, whence the photo above. Happy hacking!
