Programming

PHP, Objective-C, JavaScript.

Databases

MySQL, MS SQL, Postgresql.

Frameworks / Libraries

Zend Framework, Symfony, jQuery, Prototype, Smarty.

Other technologies / languages

XML, XSLT, XPath, DOM (Document Object Model), linux command line, PEAR, PECL, webservices, JSON.

Version control

Subversion (SVN), Perforce, CVS.