My top picks are drupal 7 and joomla! 1.7 and of course, WordPress . All are incorporating the best of each other.
WordPress – its ease-of-use and intuitive dashboard keeps it THE CMS for the blogger. According to Water&Stone Agency, WordPress still remains champ with the most downloads, most books about it, most freelance jobs, and GoogleRank.
WordPress 3.0 came out in the summer of 2010 and offered freat innovative features like: Custom Admin Username and Password, a responsive design/html5 default theme, easy to add Custom Headers, custom post types to the core, advanced menus, unified Updater, WordPress MultiSite (merge of WordPress core and WordPress MU), Simple Login Form and Automatic Security Keys.
With Version 3.3, they have upgraded the interface, tweaked it with a new Admin Bar, adding drag-and-drop advanced media uploader, children themes can now be more easily installed, administrative layout is responsive and comes with jQuery 1.7 & jQuery UI 1.8.16.