Wordpress Plugins 4 admin interface

Easy Admin Color Schemes - Advanced but has an import feature to make it simpler (I think there is also a way to just install a new scheme)
Dashboard Editor
WPhone
WPlite
Leopard Admin
JP Admin StylishBlue
Baltic Amber Themes & Schemes
Ozh’ Admin Drop Down Menu - new version for 2.7
Admin Menu
Customize Your Community
Clutter-Free
Custom Admin Branding
WordPress Admin Bar
Admin Icons
Hide Update Reminder
Add Logo to Admin
Quick Configuration Links