Client side: XHTML, CSS, JavaScript, AJAX, JSON, Flash/ActionScript, XML; JavaScript frameworks jQuery, YUI, Scriptaculous, Prototype, DOMAssistant, Ext.
Server side: PHP, PEAR, MySQL, Apache, Linux/Unix, RSS; web frameworks Ruby on Rails, Django/Python; open source applications.
Desktop: Photoshop, Illustrator, Fireworks, Flash, and Audacity.