
The
menu item parameters (not shown in full here) are a mess!
No real visual separation (like fieldsets), way too many options
all in one place, not enough explanations as to what all these settings will do
(try to explain Category Order + Primary Order results to someone..),
this really needs some work still (and is not final, I know) -it's a beta, baby :)

Already requested, not (yet?) done:
change the meaningless
date selector button graphic above [...]
to something visual like this:

or anything else that looks like a calendar / date selector.

The
Copy icon is much too pale, almost invisible on my laptop!
Just boost the edges / outlines slightly?!
The
mix of underlined text and yellow warning icons in
Configuration.
How is the user supposed to know he can rollover these icons to get a tooltip about the warning? The tooltip should be provided by the text label, same as for all other settings.
Personally, I don't like the
grouping in the Configuration screens into just 4 items:
Site, Users, Content and Server.
It is NOT clear where to look for certain things, what would each of Site, Content or Server include?
Why is Statistics not under Content?
Why are Feeds considered Content, and not Site?
There's room enough in the submenus to provide a few more links to settings such as
SEO: Metadata and SEF URL usage or not..
Labels: 1.5, administrator, beta, GUI, icons, screenshot, UI, user interface