I’ve been fascinated with Amazon EC2 for a while now. As you probably know, it provides grid computing in a way that is accessible to everyone. There are no complicated agreements to sign, just swipe your credit card and pay per CPU-hour. Use as much as you want, just pay for what you use.

Currently, Amazon EC2 offers Linux and Solaris images, but they just announced that they will be supporting Windows Server in the near future:
(http://aws.amazon.com/about-aws/whats-new/2008/10/01/amazon-ec2-running-windows-server-coming-soon/).