Rails Day

Rails Day is a competition which gives teams of developers 24 hours to build the best web app that they can using Ruby on Rails.
The first competition was held on June 4, 2005.
2005 Winners.
Out of 55 Entries that qualified:
2006 Winners.
Out of 183 Entries (only 127 actually committed anything to SVN):
Best Overall
Best Solo Project
Best User Interface
Most Creative
Most Useful