This is a simple To-do list type application built with a simple ruby backend and a sammy front-end.
The backend is built using sinatra (+rack), and cloudkit.
Besides Ruby you also need some gems. Currently, there are some issues with Rack 1.0 and Sinatra so you need to install the pre-release sinatra from github.
sudo gem install cloudkit haml sudo gem install sinatra-sinatra -s http://gems.github.com
Once you have everything installed from this directory (examples/backend) run:
!!! Todo's are stored in memory! AKA if you restart the rack application you will loose you're todos. This is really just a demonstration. If you really want to use this, check the cloudkit docs to see how to set cloudkit up to store info in Tokyo Cabinent.