WordPress 3.1 was released yesterday. Then new release includes a number of enhancements.
Some of the new enhancements include new posts formats allow different sytling to be applied to a set of defined. formats. A new linking system that makes it easier to link to posts and pages. A new admin bar provides quick access to many features from the frontend of WordPress. A separate network admin interface has been created for Super Admins for WordPress with Multisite based installation.