This is hacker news. People hack to hack. I don't understand your question.
It could be a hack just for fun. People post that kind of thing here too.
It could be a proof of concept statement about how amazing flat UI colours are. People post that kind of thing here.
Either way it would be nice to have a sentence of commentary.
It looks like it was made in response to a shot someone posted on Dribbble http://dribbble.com/shots/1044275-Flat-Map
It was rebounded and coded up, that happens quite a lot on Dribbble when devs see a design they like and have a go at putting it into css/html etc
Thank you sir....I wish I could upvote this 1000x.