Yahoo! logo and an early Yippies logo
Time machine typography.
Compass
Compass is an open-source CSS authoring framework.
Taxonomy Metadata
This plugin implements the metadata infrastructure for taxonomy terms, so you can add custom metadata (by key) to tags, categories, and other taxonomies.
Gridless
An HTML5 and CSS3 framework for making responsive, cross-browser websites with beautiful typography.
Fluid images
Techniques for incorporating images into a flexible grid-based layout.
Elastic Theme Editor
A visual theme editor and theme engine for WordPress.