Launching Next has discovered 5 usability startups.
UsabilitySquare
UsabilitySquare: Get unbiased and free feedback for free
Usability Provider
Usability Testing Service
456 Berea Street: Articles and news on web standards, accessibility, and usability
Articles and news on web standards, accessibility, usability, and other things related to web development and web design.
DevGrow - Tips on Web Design, Development and Usability
DevGrow is a blog that provides resources and tutorials on web design, development, marketing and usability.
Nielsen Norman Group: User Experience Training, UX Consulting, and Usability Research Reports
A leading voice in the user experience field, conducting groundbreaking research, evaluating interface usability, and guiding critical design decisions to improve the bottom line.