wordpress

WordPress 3.0, the thirteenth major release of WordPress is now available for download. Lots of bugfixes (1,217 in total) but one major changes : the merge of WPMU and WordPress and now you should be able to add multi-site functionality easily to your website. Enabling BuddyPress is also possible by adding the following line to wp-config.php :

define ( 'BP_ENABLE_MULTIBLOG', true );

WordPress 3.0 came with new default theme called Twenty Ten, in addition to new APIs that allow developers to easily implement custom backgrounds, headers, shortlinks, menus (no more file editing), post types, and taxonomies.
More changes are available on codex page. Download from 3.0 wordpress.org or upgrade from your current wordpress installation.