A few months ago, I tweaked the Wordpress admin css file because I wasn't keen on the Georgia typeface and disliked the menu styling (Wordpress admin CSS - geek alert!).
Well it broke under the strain of Wordpress 1.5, so because I have loads of more important things to do, I decided to tweak it again.
If anyone is interested, you can download wp-admin.css here and put it into your wp-admin directory.
It looks like this: