If you have not already updated your site already – check out the latest and greatest version of WordPress: WordPress 3.4. You can see there are a number of changes and some new functionality in place with this latest release.
If you are a developer – you will see a lot of great little additions like the introduction of term_is_ancestor_of(), WP_User::exists(), get_header_image_data(), and more (see the link above). If you are a user – you will also benefit from this release as well with the new theme options, better performance, and embed support to include tweets.
Download WordPress 3.4: http://wordpress.org/wordpress-3.4.zip