New version 2.3 offers a wide range of enhancements and new features, including:
- Automatic notification of updated plugins
- Automatic notification when new WP versions are released
- Much better management of posts and draft posts
- Improvements to the built-in text editor
- Automatic site addressing (if your address has ‘www’ in it or not, WP will let people find your site)
- A number of technical changes such as additional SQL database tables, multiple category widgets, better support for languages other than English and full support for Atom 1.0
See the full list here.
The new feature that most people will probably be the most interested in is tagging. Simply put, tagging lets you add free-form labels to your posts so you can classify your content more flexibly than only by using more rigid categories.