After wheels and trees, I made another visualization of Portage Tree: Treemap powered by Google Visualization API.

The following image is the visualization of packages installed on my system:

http://farm5.static.flickr.com/4109/4979050967_6a3a68db75_z.jpg

You can view the HTML1. Use left button to enter deep level, right button to go upper level. Darker color means the package has multiple version installed (aka slots).

Next one is the entire Portage tree:

http://farm5.static.flickr.com/4133/4979050965_6f76fbfb57_z.jpg

You can view the HTML as well but it takes very long to render! You have been warned!

You can read the script.

[1]http://ompldr.org/vNWljMw and http://ompldr.org/vNWljNg are gone.