CONSTRUCT - New/Old Style Classes, build-in/extension types

[Ilias Lazaridis]

Another topic [1] has raised the need of a deeper teach-in.

Where can I find _compact_ documentation about

 * Differece between New Style / Old Style Classes

Are there any documents available (again: compact ones) which describe
unification attemps subjecting

 * New Style Classes
 * Old Style Classes
 * Build In Types
 * Extension Types

(note: I am aware about search engines. I ask for documentation which
other developers have found useful)

.

[1]
CONSTRUCT - Adding Functionality to the Overall System
http://groups.google.com/group/comp.lang.python/browse_thread/thread/4618ccef252c82cd

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