In a nutshell, RubyURL is an online tool for converting really long website addresses into short ones.
Beyond that, RubyURL was the first project that Robby Russell (robbyonrails) built and deployed with the Ruby on Rails framework in early 2005. It's been running strong since then and until recently, was still running off of that original code base.
During the summer of 2007, Robby teamed up with Chris Griffin, User Interface Designer at PLANET ARGON, for a complete rewrite and design of RubyURL.
The RubyURL team hopes that you find this tool useful in your mailing list posts, chat conversations, and twitter entries.