I am currently searching the web for papers about UI and Keybindings/Layouts. I found one good already with interesting Statements. Would be nice to have a general link library for this. Hung Nguyen - HUMAN COMPUTER INTERACTION IN GAME DESIGN
http://www.lostgarden.com/search/label/ ... n%20design This blog has tons of awesome game-design related essays. I didn't see any on UIs in general, but there are several good ones on specific aspects of UI design.