Koalas To The Max is a website in which you can hover over dots to make smaller dots. Eventually they turn into an image.
A similar project to the one above. It just has a different image and thus different colored dots.
Data Driven Documents was used to make the websites above and the Urban Water Explorer too.
The Urban Water Explorer is pretty neat looking.
Data Viz Challenge was a visualization challenge using data in which some of the contestants used D3js from above. The entries are interesting.