Guides on creating User Experience

Apple

iPhone & iPad (iOS) User Experience Guidelines

iPhone & iPad (iOS) User Interface Guidelines

Mac OS X User Experience Guidelines

Mac OS X User Interface Guidelines

Google

Android User Interface Guidelines

Design Principles

Google TV Web Site Optimization Resources

Website Design & Content Guidelines

BlackBerry

Blackberry Browser Content Design Guidelines (PDF)

User Interface Guidelines for Blackberry Playbook Tablet

User Interface Guidelines for Blackberry Smartphones

Microsoft

Microsoft Surface User Experience Guidelines

Windows Mobile User Interface Guidelines

Windows Touch User Interface Guidelines

Windows User Experience & User Interface Guidelines

IBM

Design Principles

User experience guidelines for IBM Lotus rich client applications and plug-ins

Adobe

Adobe Flex UI Design and RIA Workflow

HP

User Interface Guidelines for Palm webOS

Enyo Design Guidelines

Motorola

Motorola Best Practices for Android User Interface

Nokia

Design & User Experience Library

Design Principles

Hildon UI Style Guide

Symbian Design Guidelines

Usability & Design Resources

Ux Resources

Oracle

Design Guidelines for Oracle Applications

Java Look and Feel Design Guidelines (Sun Microsystems)

Samsung

Samsung bada Application User Interface Guide

SonyEricsson

User Interface Rulebook (PDF)