Userfocus provides guidelines for evaluating web site usability. The cover the following different contexts.

  • Home page usability
  • Task orientation
  • Navigation and IA
  • Forms and data entry
  • Trust and credibility
  • Writing and content quality
  • Page layout and visual design
  • Search usability
  • Help, feedback and error tolerance

http://www.userfocus.co.uk/resources/guidelines.html