Users, Roles, and Authentication: Web Articles

• Restful Authentication with all the bells and whistles
  
  An extensive tutorial on setting up restful_authentication, going far beyond the basics to include all the additional code needed to turn it into a complete user management system.
• Restful Authentication with all the bells and whistles - Rails Forum - Ruby on Rails Help and Discussion Forum
  activefx
  Nice tutorial that walks through using Restful Authentication with Rails 2.×. Read through the message thread for various improvements and tweaks.
• Authorization in Rails