Ubuntu Machine is a set of Open Source Capistrano recipes - packaged as a gem - that allows you to automate the setup of a machine running Ubuntu Server 8.0.4. Those recipes allows you to easily install/setup : SSH, iptables, MySQL, Apache, PHP, Ruby (+ Ruby Enterprise Edition), Rails, Phusion Passenger, and Git.
Ubuntu Machine is released as an Open Source project.
The project announcement : http://suitmymind.com/2009/01/07/ubuntu-machine-released/
The Ubuntu Machine page on GitHub (documentation, screencasts) : http://suitmymind.github.com/ubuntu-machine/
The source code on GitHub : https://github.com/suitmymind/ubuntu-machine/
The bug tracker : http://suitmymind.lighthouseapp.com/projects/22483-ubuntu-machine/overview
The mailing-list : http://groups.google.com/group/ubuntu-machine
Follow the updates on Twitter http://twitter.com/suitmymind
It has been tested on a Slicehost slice, and on an OVH RPS.
You can watch the screencast here : http://suitmymind.github.com/ubuntu-machine/#screencast
I'll be glad to hear your feedback mailing-list : http://groups.google.com/group/ubuntu-machine
Cheers, Thomas Balthazar.