Focus: Rails and web design; very useful reading for RoR developers; by Amy Hoy.

Provides informations about rails and other newest web technologies.

Provides tips to develop with the framework and news about conferences.

Wide variety of Ruby and Rails related topics, said to be from the front.

By software developer and biology researcher; focus: Ruby on Rails, lighttpd, OS X, design issues.

By noted Rails programmer and speaker Josh Susser. Includes regular thoughts, tutorials, code snippets, meditations on RoR programming.

Mostly technical, focus: emerging Web trends and application frameworks, mainly Ruby on Rails, asp.net.

Offers development tutorials and tips.

Provides several tutorials for advanced developpers.

By Rails' original developer, David Heinemeier Hansson.