WordPress 2.8 packs has several features including theme browser and installer which is much more customizations to the admin dashboard, a better widgets API among other things.
The latest and greatest version of WordPress, version 2.8 represents a nice fit and finish release for WordPress with improvements to themes, widgets, taxonomies, and overall speed. They also fixed over 790 bugs.
WordPress 2.8 Features:
* You can browse the entire theme directory and install a theme with one click from the comfort of your WordPress dashboard.
* The new CodePress editor which gives syntax highlighting to the previously-plain editor.
* The complete redesigned widgets interface
* The new Screen Options on every page.
WordPress 2.8 Baker is much faster to use. They have changed the way WordPress does style and scripting which is new to user.