After a major release of WordPress 3.0 couple of weeks back WordPress has released Updated WordPress 3.0.1 today. This version is known to fix more than 50 minor bugs in WordPress 3.0.
The complete list of Bugs fixed in latest version of WordPress blogging platform can be seen here
If you have already upgraded your blog to WordPress 3.0 you can upgrade it from within admin dashboard you can also download the latest version from wordpress.org. But do remember to take backup of database and files before hitting the update automatically button