Front-end developer Marco Barbosa has just released his advanced Joomla admin template: Minima.
This is a template for the Joomla administrator that changes the way it's presented. It also adds quite a few nifty features to the interface.
Minima is built using advanced CSS and other modern techniques. For that reason, you should use Firefox, Chrome, Safari or another browser with the latest CSS support to get the full experience from the template.
You will also need Joomla 1.6, as the template will only work on that version of the Joomla framework.