WordPress 3.0, code-named Thelonious, the thirteenth major release of WordPress has officially been released and is now available for download or, alternatively, you can upgrade within your dashboard.

The features in this release include a lovely new default theme called Twenty Ten. Also, theme developers have new APIs that allow them to easily implement custom backgrounds, headers, shortlinks, menus,  post types, and taxonomies. These features are all showcased in the default theme, Twenty Ten. Thelonious also include the merging of MU and WordPress, creating the new multi-site functionality which makes it possible to run one blog or ten million from the same installation.

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