Have you seen the latest addition to the Site Tools section of Control Panel?
It’s called App Installer, and it is an easy to use installation tool for a number of third-party applications, including WordPress, Drupal, BlogEngine.NET, DotNetNuke, phpBB3, and many more.
App Installer installs the applications, but updating them is still your responsibility, so you may want to make sure you’re comfortable upgrading one of the packages before you install it. A lot of these third-party apps are very popular, and are updated quite often.