raven.rb is a Ruby library implimented by Thomas Counsell ( email@example.com) that allows a Ruby CGI program to protect itself using Raven. It is currently a beta release.
I also have ruby scripts to authenticate via raven using a webrick server and for ruby on rails applications. Contact tamc2 if you need them (I will clean them up and post them at some point).
Furthermore, I have various ruby on rails sites working with Raven. Contact tamc2 if you would like to see the code.