The latest and greatest version of the WordPress software — 3.3, named “Sonny” in honor of the great jazz saxophonist Sonny Stitt — is immediately available for download or update inside your WordPress dashboard.
WordPress has since more than 65 million downloads version 3.0 was released, and in this third major iteration WordPress has significant Polish around the new user experience, navigation, upload and import added.
As user’s point of view, Advanced users will appreciate the new drag and drop uploader, the hover menu, navigation, toolbars, improved co-editing support and new Tumblr importer. WordPress has also taken care of experience WordPress as for people who are completely new to the software.
There is a ton of candy for developers as well. It is era of new editor API, new jQuery version, better ways to hook into the help screens, more performant post-slug-only permalinks, and of course the entire list of improvements on the Codex and in Trac.
You can find detailed information here.