Amazon allows you to use a computer in the cloud for free (for 1 year).
To have a go, visit http://aws.amazon.com/free/ sign up then log in.
This is your AWS Management Console:
Click on EC2 and follow the instructions to launch a virtual server, also called Amazon Elastic Compute Cloud (Amazon EC2) instance.
Just to make things easier, choose the “Quick Launch Wizard”, choose a name for your instance and create a new key pair.
Download the key (e.g. webserverkey.pem) and save it in a folder, e.g. ~/.ssh
To ensure the user can read the key, go to terminal and type:
sudo chmod 400 ~/.ssh/webserverkey.pem
Then choose a launch configuration, e.g. Ubuntu Server 12.04 LTS – 64 bit and click CONTINUE.
Now you can either edit the details of the newly created instance or launch it.
When ready, click on LAUNCH then CLOSE.
You will be automatically redirected to you AWS Management Console which now shows the new instance in the section “My Resources”.
If it doesn’t, just click on REFRESH.
Your instance is ready to use!
To stop or terminate a running instance see read this: