First Andrei posted a note about it and now Scott Mattocks has made his own comments on the release of the PHP-GTK 2 Alpha version .
This is the first release of PHP-GTK 2. PHP-GTK 2 is a PHP extension that combines the power and flexibility of both PHP 5 and GTK+ 2 to allow developers to create stand-alone desktop GUI applications using PHP.
Scott reminds all potential users of this release out there that this is most definitely aplha and shouldn't be used in production due to some bugs and feature changes that will need to be resolved.
If you're still interested, you can grab the download from the PHP-GTK site and check out the new manual or subscribe to the mailing list for a little help.