Dave Wood 
Basics Interactive Design: Interface Design [PDF ebook] 
An introduction to visual communication in UI design

If you want to design successful user interfaces then you need clear and effective visual communication. Interface Design will help you achieve this using a range of incisive case studies, interviews with professional designers and clear hands-on advice to help you produce user-focused front-end designs for a range of digital media interfaces. This book introduces the major elements of graphic design for digital media layout, colour, iconography, imagery and typography, and shows how these visual communication basics can combine to produce positive interactive user experiences. With practical advice on improving communication between designers and developer, and a tantalizing look at designing interactivity for all five senses, this is a must-have introduction to developing interfaces that users will love.