Ubuntu on Amazon EC2 Beta Released | The Fridge
"This service allows you to create a fully running instance of Ubuntu Server on EC2 in just a few clicks. All the applications you’ll need such as a Web server, E-mail server and common development frameworks are available. There’s no charge for using Ubuntu on Amazon EC2, it’s provided without charge complete with maintenance updates. Separately, Amazon will charge EC2 users for their usage of the service."