Hi. I'm the west panel.
north - generally for menus, toolbars and/or advertisements
Included in ext-all-debug.js is the Ext Debug Console. It offers a limited amount of FireBug functionality cross browser. The most important feature is the "DOM Inspector" and CSS and DOM attribute editing. In any browser where "console" is not already defined, the Ext console will handle console.log(), time() and other calls.
This page includes ext-all-debug.js and some test markup so you can try it out. Click on the image below to bring up the console.
The full source is available in the "source" directory of the Ext download.
south - generally for informational stuff, also could be for status bar