Today, the newest version of popular open source blogging software WordPress was released. Version 3.0, also known as “Thelonious,” has undergone a significant number of improvements, such as the inclusion of new standard APIs that let theme developers easily implement new backgrounds, headers, menus, custom posts, and more.

All of the new APIs are shown off in the new default theme called “Twenty Ten.”

For users, support for URL shorteners has been included in WordPress 3.0, so you can tie your blog to your favorite link shortening service, and generate short links from within the WordPress dashboard.

In total, there are more than 1,200 bug fixes and feature enhancements in this version of WordPress. If you’re a user of the software, simply go to Tools>Update in your dashboard to download and install the new version either automatically or manually.