Just watched the screencasts from the Hobo website, and must say I'm pretty amazed. So, what is Hobo?

Hobo is an Open Source extension to Ruby on Rails which helps you build full blown web applications incredibly quickly and easily. Available as a Gem or Rails plugin, Hobo provides a simple, clean and elegant development framework which allows for rapid prototyping or production of the most sophisticated web applications.

Watch the screencasts and try to keep your drooling levels low.