When I logged into WordPress control panel, it prompted it has the new version. It’s WordPress 2.5. This great blog engine is free and easy to setup and upgrade. The new version has the following new features,

1. Cleaner, faster, less cluttered dashboard
2. Better Dashboard Widgets
3. Multi-file upload with progress bar
4. Password strength meter
5. Concurrent editing protection

and more. For details, you can take a look of their blog here. If you are using WordPress for your blog already, upgrade is easy, still.