As of May 28, 2010, WordPress released WordPress 3.0 Release Candidate 1 (RC1). This release has all features finished, all bugs squashed, and all potential issues addressed. But please keep in mind, this is only the release candidate — don’t install or upgrade your live site with this version unless you know what you are doing.
Things you need to know about this release candidate:
- Custom menus are finished!
- Multi-site is all set.
- The look of the WordPress admin has been lightened up.
- There are a ton of changes, so all your plugins need to be tested for compatibility.
- Themes also need to be tested for compatibility.
- And a couple of known issues. Please read them carefully here.
You can read their announcement here.
Download and try WordPress Release Candidate 1.