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First, here's the official website :
    http://www.zend.com/zend/api.php

The official documentation for the Zend API :
    http://www.php.net/zend.php

Derick also made a presentation on the subject :
    http://www.derickrethans.nl/ze-ext/

Now for some history. This information was originally published within the following book :
 
Web Application Development with PHP 4.0 by Tobias Ratschiller and Till Gerken
    http://www.amazon.com/exec/obidos/ASIN/0735709971/wwwphpnet

And updated/altered by Zend and published under the "Open Publication License" and is continually being updated. For informational purposes, a link to the "notice" of this publishing is here:
    http://marc.theaimsgroup.com/?l=php-general&m=97068439903171&w=2

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    engine-api-doc-subscribe@lists.zend.com