Website Code
HTML 4/5
I am a strong believer in the future of HTML5, but I recognize that it isn't supported widely enough to depend on. For my sites, I stick to the HTML 4.01 standard, but do in addition include the new semantic tags (section, article, blockquote, etc.) to take advantage of modern browser features. My code is clean, leveled, and extensively documented. 'View Source' or use your web inspector to take a look.
CSS
I use both basic CSS features and new advanced features of CSS (shadows, transitions, etc.). In every applicable case, I prefer styling with CSS over using images, speeding up workflow and reducing load time. Use of @media allows effective styling for multiple screen sizes and devices, allowing sites to span desktop, tablet, and mobile platforms. Resize your window to check it out.
Javascript / JQuery / MooTools
For the interactive components of my sites, I use Javascript. For stock elements (menus and tabs), I use components written with the MooTools Javascript library. For custom elements and transitions I use the JQuery library. Click "more" on the menu bar to see it in action.