Recently, one of our partners developed a Ruby client for the Eloqua API.
If you are using Ruby to build on the Eloqua platform, you will definitely want to check it out.
Code is available here kapost/eloqua_api · GitHub
Gem is publicly available here eloqua_api | RubyGems.org | your community gem host
Please note, this code is not supported by Eloqua, as it was developed by a third party.