I once saw a theme/theme framework for wordpress that has some cool features in the admin interface. Why Cool? the thing that really attracted me is the slider that lets you adjust width and values just by sliding the slider, and i also liked the dragging and dropping thing. The problem is I forgot to bookmark it. Please let me know if you know this theme for WP. or you know a similar theme that has a cool admin features.
First -- you can always make your own: http://codex.wordpress.org/Creating_Admin_Themes
and then I also found some pre-developed admin themes you could try, but let me warn you. It is very unlikely that a custom administration theme would work every time you update wordpress... You might be digging a hole under yourself wanting to do this. :)