In WordPress 3.0 you have the possibility to easily upload and use a background image. The image is positioned via CSS in the background. Thus it is not quite simple to have the possibility of auto resize and the background adapts to the size of the browser. There are some nice possibilities for this request, I will briefly highlight a very simple way of using CSS, since then the function of WordPress will not be effected.
WordPress 2.7 has been released these days and comes with some updates to the backend design. I think most of you already know that there is a new login-section. The design is now equal to the new backend's and the team did only little changes.
From my point of view this is very important to an all-inclusive-package, like a theme – or a corporate design.
The CSS changed a bit and if anybody wants to customize the login-section, I will show how to achieve it. The CSS is also included as a good starting point for your own custom design.