I downloaded 2.0.5, both VC6 and VC6-non-thread-safe. Installed both dll on a directory. Updated php.ini:
zend_extension_ts="C:\Program Files\Zend\ZendServer\lib\xdebug\php-5.2.x\php_xdebug.dll"
;zend_extension="C:\Program Files\Zend\ZendServer\lib\xdebug\php-5.2.x\php_xdebug_nts.dll"

[XDebug]
xdebug.remote_enable=on
xdebug.remote_handler=dbgp
xdebug.remote_host=localhost
xdebug.remote_port=9000

phpinfo shows:
Version: 5.2.11
Thread safety: disabled
Debug build: no

But I do not see the Xdebug paragraph, nor can I get Xdebug to work from NetBeans.
I use Zend Apache 2.2.14, with PHP and MySQL installed.