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Userdesign.com:
http://www.userdesign.com/index.html
TASK-CENTERED USER INTERFACE DESIGN
A Practical Introduction
http://bmrc.berkeley.edu/courseware/cs160/fall99/Book/contents.v-1.html
Shneiderman's "Eight Golden Rules of Interface Design"
http://www.cs.utexas.edu/users/almstrum/cs370/elvisino/rules.html
Principles of good GUI Design
http://axp16.iie.org.mx/Monitor/v01n03/ar_ihc2.htm