"Developers and network admins will appreciate the long-awaited merge of MU and WordPress, creating the new multi-site functionality which makes it possible to run one blog or ten million from the same installation."
Theme developers, new APIs for custom backgrounds, headers, shortlinks, menus, post types, and taxonomies.
The 2010 default theme for WordPress.
"I'm proud to acknowledge the contributions of the following 218 people to the 3.0 release cycle. These are the folks that make WordPress what it is......."
WordPress - Blog Tool and Publishing Platform
A semantic personal publishing platform with a focus on aesthetics, web standards, and usability.