WordPress 3.0 beta 2 has been released and is available for download. Before beta 2 beta 1 has been released. According to the wordpress development team some few improvement are still left in beta 2
- Revised menu user interface
- Changes to the WordPress exporter and importer to make it more flexible
Still some improvement are left to be done in 3.0 therefore i recommended you not to use beta version in your working blog. But u can test it by uploading into any test blog.