By Dr Greg Ross
The Magic Table is a JavaScript library that allows you to see more in your data by applying some simple visual techniques to transform a table.
See this jsFiddle for an example of how to convert an HTML table to a Magic Table.
More information and examples can be found here.
See also...
An HTML scrollbar with highligting for easy access to information
An overview+detail visualisation for navigation in Excel spreadsheets
A pure JavaScript implementation of a Voronoi tessellation
3D surface plotting in JavaScript via WebGL
A pure JavaScript implementation of a 3D surface plot