24 Sites are listed here

Check the latest added sites

37 Signals` work

• Basecamp - Project management and collaboration
  
• Campfire - Real-time group chat
  
• Backpack - Information organizer and calendar
  
• Tadalist - Simple and sharable todo lists. Nothing more
  
• Writeboard - Simple and sharable text documents
  

Found on rubyonrails.org

• 43things.com - A rapidly growing web 2.0 application about goal sharing
  
• odeo.com - A large web 2.0 application used for audio sharing
  
• shopify.com - Create your own and custom e-commerce site in minutes
  
• fluxion.com - Create, organize and share you digital assets
  
• strongspace.com - Secure file hosting
  
• Typo - Open Source blogging engine
  

Some more great work

• ajaxed.com - Simple and useful it allows you to add the latest ajax features to your existing web site without the
  need for custom programming.
  
• atopsites.com - A great clone of alexa.com
  
• asoboo.com - Community site for creative people (deployed on win2003)
  
• thebeststuffintheworld.com - Interesting web 2.0 application
  
• dealplumber.com - Another interesting community site
  
• digital-tunes.net - A really nice e-commerce site for audio
  
• flagr.com - By using google maps it allows you to save real world places in an interesting way
  
• godefy.com - Comparison of various internet marketing companies/products
  
• loveexpress.fr - A french dating site
  
• podomatic.com - Web application for sharing podcasts
  
• pixrat.com - Social picture bookmarks
  

Sites offered by you

Latest

• rentspider.com - A new website - 100% Ruby and Rails. Its frontend includes flash, too.
  
• fiveruns.com - FiveRuns is a simple, modern, Web 2.0 application that presents relevant, actionable data in an appealing, intuitive, and logical user interface.
  

Well, in case that you’ve got a great project that should be listed here, we will appreciate to post a comment here with a link. Thank you in advance.