FamFamFam, for the amazing and free 'Silk' icon set;
Mozilla, for giving us the Firefox browser;
Chris Prederick, for his awesome Web Developer extension;
Joe Hewitt, for the equally awesome Firebug extension;
Justin Poliey, for his TwitterLibPHP work;
All of the webcomic artists, who work tirelessly to entertain us;
And, of course, our users!