The easiest way to test Ruby 2.0

Bitnami Rubystack: (from the link)

BitNami Ruby Stack greatly simplifies the development and deployment of Ruby on Rails applications. It includes ready-to-run versions of Apache, MySQL, Ruby and Rails and required dependencies. It can be deployed all-in-one free native installers, virtual machines and Cloud Images. BitNami Ruby Stack is distributed for free under the Apache 2.0 license.