Yesterday I moved a server from Rackspace cloud to Amazon EC2. I must say setting up the Amazon EC2 instance was a bit frustrating as this was my first time and there are way too many options in the EC2 management console!
The advantage is now that this server is setup I can create an AMI (Amazon Machine Image) and then easily and very quickly create new instances. No need to install Apache, MySQL, Perl modules, etc.
With Rackspace you can also create a backup of a virtual server to use it as a base image for a new server if I’m not mistaken.