Windows Azure Websites (http://www.windowsazure.com/en-us/home/scenarios/web-sites/) is similar to what you're describing, you can install a variety of popular platforms in one click (ie Wordpress, Drupal, Joomla, DotNetNuke,...) and get up and running right away. You own your data, the apps (ie Drupal, not Azure itself) are open source, and most things are easily managed for you.