We are thinking about TargetProcess v2.0 UI and digging the web to get new ideas and build something incredibly simple. So some relevant links that will be helpful for anyone who build user interface:
Natural Selections: Colors Found in Nature and Interface Design
Why colors from nature better than standard safe web palette.
"NatureÂs colors are familiar and have a widely accepted harmony."
The Pursuit of Interface Design Simplicity
How to focus on simple interface.
"It is simplicity that is difficult to make."
The Yellow Fade Technique
How to show user what changed on the page. Useful for Ajax-based pages.