Languages: Albanian/Arabic/Chinese/Czech/Deutch/English/Esperanto/French/Greek/Indonesian/Italian/Japanese/Lithuanian/Hungraian/Nederlands/Norsk/Polish/Russian/Spanish/Turkish
Compatibility: Windows 2000/XP/Vista/Seven
License: Freeware.

Author's description:
A complete and ready-to-use environment for PHP developers.

EasyPHP is a WAMP package including the scripting language PHP, the web server Apache, the SQL server MySQL, as well as easy development tools such as the database manager PhpMyAdmin and the debugger Xdebug. Nothing to configure. It's already done!

EasyPHP is portable

You can install it on your system or on a USB drive and develop or present locally your PHP code, projects, websites, scripts, applications...

Modules : pre-configured applications for EasyPHP

Dowload, install and test applications like WordPress (Blog), Spip, Drupal, Joomla (Content Management System-CMS), Prestashop (eCommerce/Online Shop), phpBB, Phorum (Forum) ...

Website : http://www.easyphp.org/
Download page: http://www.easyphp.org/download.php

Yes, a portable WAMP quite would be nice addition. I've been looking for something like that, thanks for the tip.