What’s new in 3.0? One of the best ways to find out is to try out the new Twenty Ten theme, which shows off many of the release’s (which is also called “Thelonius”) major new features, including custom backgrounds, headers, shortlinks, menus, post types and taxonomies.
This is a quick tour about the newest features of wordpress.
More great themes and plugins are on development. The greatest advantage of 3.0 is it integrates the WordPress MU Code. So you can run a multiple website management system from single backend using the new version. Also it is much more fast than the earlier versions. Just a quick look of new features here . And you can try it by loging into wordpress.com