This infographic illustrates the preferred migration path for transitioning to Joomla! 3.0. We recommend most users on version 2.5 wait to upgrade until 3.5 is available. More information is available at http://community.joomla.org/blogs/community/1682-joomla-25.html
If you are marketing Joomla!, you are welcome to download and use this graphic to explain the preferred migration path.