General

• Guide to Use of Graphics for Websites
• Tutorial: Global Interface Design
• The MIME Project at Georgia Tech
• Computer Intelligence?
• HCI and Affective Computer Interfaces

Error Messages

• Error Message Design
• Error Messages, Screen Design, Color
• Error message guidelines from useit.com

Color

• Do Color Models Really Make a Difference?
• Voyage through a Color Cube
• Color Tables
• The Color Maker
• 256 Color Picker
• The Color FAQ
• Color Combinations
• Using Color on the Web
• Color Palette's
• Frequently asked questions about colour physics
• Color Wheel Pro software for selecting a color scheme