node.js knockout (probably better called the "Node Knockout", but hey) is a 48 hour coding contest in the same vein as the Rails Rumble - it takes place on August 28-29, 2010. Naturally, the aim is to use node.js, and the contest format is as such:

Build any web project you can imagine;
In 48 hours, starting from scratch;
With a team of up to 4;
Using node.js and whatever additional technology you want

Node Knockout

Thanks to @elliottcable for the lead.