I’m perfectly aware this is a google away. Unfortunately I don’t know the name of the chart I’m looking for. So I’m unable to make a reasonable search for plugins or API’s. Please be kind.
What is this type of charts called?
What i want to do:
Draw a chart similar to below in a webbrowser, given input as a list of “sizes”. Preferably with a jquery plugin or javascript API.
In the image below the sizes happens to be Disk-sizes.

This is called a Tree Map. You can reproduce using a number of JavaScript libraries. Here are a couple:
Note: D3 is actually a rewrite of Protovis.