Are you guys planning on using the Joomla! 1.6 (or Joomla! 1.5) UI as default for the backend (toolbar, tabs, etc etc), or are you open to developing a (maybe) better UI?
Because there is just one idea that keeps popping into my head, that I will probably implement in my extensions at a later moment. The attached screenshot shows what I mean.
At the moment in Joomla! 1.6, the top to first item (in this case an article) is 311 pixels, because of the admin template header, the large toolbar etc. Off course the admin template is probably not a subject for this project, but the toolbar is, right?
The toolbar (most of the time) shows a huge text and huge icons, which take up a lot of space, forcing the actual "core" of the page, the items, down.
I noticed that in the Joomla! 1.5 distribution, Nooku Server, they also had this idea and improved the entire admin template, which now has a better screen real estate, as shown in the middle part of the screenshot. (Love that admin template btw :-))
Because this project probably only focusses on extensions, not the admin template, the third part in the screenshot shows just a quick example of how I would suggest to save some space at the mentioned areas, without moving away from the standatd Joomla! UI logic to much (show page title, toolbar, tabs). I quickly added the "New" button in my example, but in my idea it would be aligned right, a bit larger and off course have the chosen new icon.
Joomla! 1.6 = 311 pixels
Nooku Server = 175 pixels, 136 pixels saved
Example = 220 pixels, 91 pixels saved
Might this be something to consider?